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PERCEPATAN PENGEMBANGAN PERTANIAN LAHAN KERING IKLIM KERING DI NUSA TENGGARA Mulyani, Anny; Nursyamsi, Dedi; Las, Irsal
Pengembangan Inovasi Pertanian Vol 7, No 4 (2014): Desember 2014
Publisher : +622518321746

Show Abstract | Download Original | Original Source | Check in Google Scholar

Wilayah Nusa Tenggara memiliki iklim kering dengan curahÂ hujan kurang dari 2.000 mm/tahun. Sekitar 72% wilayahnyaÂ berbukit dan bergunung dengan solum tanah dangkal dan berbatu.Â Kondisi ini menjadi tantangan dalam pengembangan pertanian.Â Oleh karena itu, Balitbangtan melaksanakan kegiatan percepatanÂ pengembangan pertanian di lahan kering beriklim keringÂ sejak tahun 2010 sampai sekarang. Hasil identifikasi sumberÂ daya alam dan sosial ekonomi menunjukkan permasalahan utamaÂ yang dihadapi dalam pengembangan pertanian ialah curah hujanÂ rendah, ketersediaan air terbatas, serta produktivitas dan indeksÂ pertanaman rendah (IP < 100). Di beberapa lokasi terdapatÂ sumber air permukaan (sungai, embung, dam parit, mata air) danÂ air tanah yang belum dimanfaatkan. Oleh karena itu, BalitbangtanÂ melakukan eksplorasi sumber air dan desain distribusinyaÂ dengan sistem gravitasi untuk dimanfaatkan pada musimÂ kemarau untuk area 5-15 ha. Selanjutnya, masyarakat diperkenalkanÂ dengan inovasi teknologi varietas unggul, pengelolaanÂ hara (pupuk organik, pupuk hayati, pembenah tanah), pembuatanÂ kandang komunal, dan pengelolaan limbah menjadi kompos.Â Pembelajaran yang dapat diambil dari kegiatan ini ialah sulitnyaÂ mengubah etos kerja dan kebiasaan petani untuk memanfaatkanÂ potensi sumber daya alam secara optimal. Ke depan, selainÂ teknik budi daya, diperlukan pendampingan dan pembinaanÂ kelembagaan secara intensif, termasuk memotivasi petani dalamÂ pengembangan pertanian di wilayahnya.

STRATIFIKASI SIMPANAN KARBON DIATAS PERMUKAAN TANAH PADA LAHAN GAMBUT PASANG SURUT DAN LEBAK [The Stratification of Above Ground C-Stock in Tidal Peatland and Fresh Water Swampland] Zakiah, Siti Nur; Wakhid, Nur; Nursyamsi, Dedi
BERITA BIOLOGI Vol 16, No 3 (2017)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

The carbon stored in peatlands is huge not only from soil but also from vegetation. Carbon stocks can decrease when there are human activities such as land use changes. Measuring and monitoring carbon stocks are necessary as the basis for assessment of the impact of land management technology applications to conservation and carbon emissions associated with sustainable management system of peatland. The purpose of this study was to determine the stratification of above ground C-stock in tidal peatland and fresh water swampland. Above ground C-stock stratification based on the types of vegetation. The stratification was conducted to distinguish vegetation conditions based on the volume of biomass and carbon content in an observation plot. The measurement of above ground C-stock was carried out by destructive and non destructive refers to Hairiah K and Rahayu (2007), after that the estimation of carbon stockswas conducted on tidal peatland (land use rubber + pineapple, rubber folk and shrubs) and peat in fresh water swampland (land use rubber 4-5 years and 2-3 years). The results showed that the types of vegetation, plant density and management affect of carbon stocks. Carbon stocks in tree vegetation are higher than shrubs. The high of plant density affects the sunlight used for photosynthesis, through photosynthesis, CO2 is absorbed and converted by plants into organic carbon in the form of biomass. Arrangement and maintenance of the plant affects the storage of carbon in a land use.

Residu Pestisida di Sentra Produksi Padi di Jawa Tengah Ardiwinata, Asep Nugraha; Nursyamsi, Dedi
JURNAL PANGAN Vol 21, No 1 (2012): PANGAN
Publisher : Perum BULOG

Dewasa ini pestisida sudah merupakan bagian dari sistem usahatani sebagianbesar petani di Indonesia. Penggunaan pestisida semakin intensif dan cenderung tidak terkontrol; akibatnya agroekologi pertanian dan kesehatan manusia sebagai konsumen menjadi terabaikan.Penelitian ini bertujuan untuk mengidentifikasi status penggunaan pestisida dan residunya yang dilaksanakan dengan mengambil contoh tanaman padi, tanah, dan air di sentra produksi padi di Jawa Tengah. Konsentrasi residu pestisida dalam contoh ditentukan dengan menggunakan kromatografi gas (GC). Hasil penelitian menunjukkan bahwa petani di Jawa Tengah sudah terbiasa menggunakan pestisida karena diyakini bahwa pestisida ampuh dalam menanggulangi serangan organisme pengganggu tanaman (OPT). Namun demikian penggunaan pestisida di petani umumnya belum berdasarkan prinsip pengelolaan hama terpadu (PHT), yaitu pestisida digunakan dalam jumlah sesedikit mungkin dalam batas yang efektif dan diaplikasikan apabila tingkat kerusakan tanaman atau kepadatan populasi organisme pengganggu melampaui batas toleransi ambang ekonomi. Meskipun penggunaan insektisida organoklorin telah dilarang dan hasil wawancara dengan petani tidak ditemukan penggunaannya di lahan sawah, tetapi residunya di lapangan masih ditemukan sehingga berpotensi mengganggu kelestarian lingkungan. Residu insektisida organoklorin dan organofosfat telah ditemukan dalam contoh tanaman padi, tanah, dan air di sentra produksi padi di Jawa Tengah (Kabupaten Grobogan, Demak, Pemalang, Brebes, Tegal Cilacap, Kebumen, Sragen, dan Klaten), sedangkan residu insektisida karbamat hanya ditemukan di Kabupaten Klaten, Demak, Cilacap, dan Pati.Presently, pesticide has already been a part of farming system of most farmers in Indonesia. The use of pesticides has become more intensive and tended to be uncontrolled; consequently agro-ecological agriculture and human health as consumers have becomeneglected. This research is aimed to identify status of use of pesticides and their residues that is carried out by collecting rice plant, soil, and water samples from paddy fields of rice production centers in Central Java. Concentration of pesticides residue in the samples is determined by using Gas Chromatography (GC) method. The results show that farmers in Central Java use the pesticides because they believe that the pesticides are significantly effective in tackling pests attack. However, the use of pesticides by farmers generally has not been based on the principles of integrated pest management(IPM), a pesticide used inamounts as little as possible withinthe effective limits (no-exaggeration) and it is applied when the extent of damage to crops or pests population densities exceeds the economic threshold. Although the use of insecticides of organochlorine has been prohibited and the interview result reveals that the farmers do not use it in paddy fields, the residues on the paddy field are still found, so that they potentially pollute the environment. Organochlorine and organophosphate insecticide residues are found at rice plants, soil, and water samples taken from paddy field of riceproduction centers in Central Java (District Grobogan, Demak, Pemalang, Brebes, Tegal,Cilacap, Kebumen, Sragen, and Klaten), whereas the carbamate insecticide residuesare only found in Klaten, Demak, Cilacap, and Pati Districts.

Efektivitas dan Neraca Hara Pupuk SNL dan SNP dalam Tanah Padi untuk Sawah (Oryza sativa L.) pada Inceptisol Karawang (Effectiveness and Nutrient Balance ofSNL and SNP Fertilizers in the Soilfor Paddy Rice (Oryza sativa L.) at Inceptisol of Karawang) Nursyamsi, Dedi
JURNAL PANGAN Vol 21, No 4 (2012): PANGAN
Publisher : Perum BULOG

Pemupukan merupakan tindakan yang harus dilakukan untuk meningkatkan produksi padi nasional. Pupuk SNL dan SNP yang masing-masing berbentuk cair dan bubuk serta diaplikasikan dengan cara disemprotkan ke tubuh tanaman dan permukaan tanah berpotensi meningkatkan produksi padi sawah. Penelitian yang bertujuan untuk mempelajari efektivitas dan neraca hara pupuk SNL dan SNP dalam tanah untuk padi sawah (Oryza sativaL.) telah dilaksanakan di Tanah Inceptisol Karawang pada MH 2007/2008. Dua unit percobaan lapang (percobaan SNL dan SNP) menggunakan rancangan faktorial (dua faktor) dalam rancangan acak kelompok, 3 ulangan, dan padi variets Ciherang. Faktor pertama adalah 0, SNL 5 L/ha, dan SNL 5 L/ha +SNP 5kg/ha (unit pertama), serta 0dan SNP 5kg/ha (unit kedua). Faktor kedua adalah 0, NPK 25 persen, NPK 50 persen, dan NPK 100 persen berdasarkan uji tanah. Hasil penelitian menunjukkan bahwa kombinasi pupuk SNL dan SNP efektif meningkatkan hasil padi sawah jika pupuk NPK diberikan dengan dosis 100 persen dosis anjuran. Pemberian SNL 5 L/ha dan SNP 5 kg/ha pada pemupukan NPK 100 persen memberikan hasil gabah tertinggi (7,35 t/ha). Walaupun demikian pemberian kedua pupuk tersebut hanya menyumbang hara: 0,575 kg N, 0,292 kg P205, dan 0,276 kg Kpper hektar. Dengan demikian peningkatan hasil gabah tersebut sangat tergantung pada kontribusi ketersediaan hara N, P, dan K dalam tanah.Fertilizer application is a must to increase national rice production. SNL and SNP fertilizers whichhave liquid and powder forms respectively and are usually aplied on plant and soil surface have potential to incrase rice production. Experiments aimed to study the effectiveness and nutrient balance of SNL and SNP fertilizersin soil for paddy rice (Oryza sativa L) was conducted at Inceptisols ofKarawang in WS 2007/2008. Two field experiments (SNL and SNP experimets) were arranged using factorial design in a Randomized Completely Block Design, three replications, and rice of Ciherang variety. The first factor was: 0, SNL 5 Uha, and SNL 5 Uha +SNP 5 kg/ha (first unit), as well as 0 and SNP 5 kg/ha (second unit), while the second factor was: 0, NPK 25percent, NPK 50percent, dan NPK 100 percent base on soil test. The results showed that combination ofSNL and SNP effectively increased yield ofpaddy rice when NPK fertilizer was given at a dose of100 percent recommendations. Use of SNL 5 Uha and SNP 5 kg/ ha combined with NPK fertilizersat 100 percent reccomendation gave the highest grain yield (7.35 t/ha). Nevertheless the use ofboth fertilzers only contributed nutrients of0.575 kg N, 0,292 kg P205, and 0,276 kg K20 perhectare. Thus the increase of grain yield was highly dependent on the contribution of nutrient availability ofN, P, and K from the soil.

Pengelolaan Tanaman Terpadu pada Padi Sawah yang Ramah Lingkungan (Integrated Crop Management in Rice Environmentally Friendly) Wihardjaka, Anicetus; Nursyamsi, Dedi
JURNAL PANGAN Vol 21, No 2 (2012): PANGAN
Publisher : Perum BULOG

Sistem usahatani ramah lingkungan diartikan sebagai usahatani untuk memperoleh produksi optimal tanpa merusak lingkungan baik secara fisik, biologis dan ekologis. Selain itu sistem ini juga harus menjamin keberlanjutan sistem produksi. Pendekatan Pengelolaan Tanaman Terpadu (PTT) pada padi sawah yang bersifat ramah lingkungan diyakini dapat mengakomodasi teknologi untuk peningkatan produksi padi, sekaligus memelihara kelestarian lingkungan biofisik, serta menjaga keberlanjutan sistem produksi padi sawah.Penerapan teknologi mitigasi emisi Gas Rumah Kaca (GRK) di lahan sawah selain dapat mempertahankan dan meningkatkan produksi padi, juga dapat mereduksi emisi GRK secara signifikan.Dengan demikian maka untuk menjamin peningkatan produksi padi, sekaligus memelihara kelestarian lingkungan lahan sawah serta menjaga keberlanjutan sistem produksi padi, maka teknologi mitigasi emisi GRK di lahan sawah perlu ditambahkan dalam paket PTT.Environmentally friendly farming system is defined as afarmto obtain an optimal production without physically, biologically andecologically damaging the environment. In additionthis system should also ensure the sustain ability of production systems. Integrated crop management (ICM) aproachin paddy ricefield is believed tobe able to accommodate environmentally friendly technologies which increaserice production, maintain sustainability of biophysical environment, as well asmaintain sustainability of rice production systems. Application of GlassHome Gas (GHG) emissions mitigation technologies in paddy rice field do not only maintainand increaserice production, but also reduce GHG missions significantly. Thus,toguarantee an increase inrice production, sustainability of bio physical environment, and sustainability of rice production systems, the GHG emission mitigation technology inpaddyrice fields should be addedin the ICM package.

Efektivitas dan Neraca Hara Pupuk SNL dan SNP untuk Jagung pada Tanah Inceptisol di Bogor Nursyamsi, Dedi
JURNAL PANGAN Vol 20, No 3 (2011): PANGAN
Publisher : Perum BULOG

Percobaan lapang yang bertujuan untuk mempelajari efektivitas dan kontribusi hara pupuk SNL dan SNP terhadap tanaman jagung telah dilaksanakan pada tanah Inceptisol,di Bogor pada MK 2008. Percobaan terdiri dari 2 unit, yaitu unit SNL dan SNP dengan menggunakan tanaman indikator jagung hibrida varietas pioneer 21 (P21). Perlakuan ditata dalam Rancangan Acak Kelompok dengan 8 perlakuan dan 3 ulangan. Perlakuan merupakan kombinasi dari 2 faktor, yaitu faktor pertama takaran pupuk NPK : 0, 25, 50, dan 100 persen dosis anjuran berdasarkan uji tanah, sedangkan faktor kedua adalah pupuk SNL : 0 dan 10 l/ha (unit I) dan SNP 0 dan 10 kg/ha (unit II). Hasil penelitian menunjukkan bahwa pemberian SNL dan SNP tidak efektif meningkatkan pertumbuhan dan hasil tanaman jagung apabila dosis NPK < 100 persen dosis anjuran. Pupuk SNL efektif meningkatkan pertumbuhan dan hasil jagung jika pupuk NPK diberikan dengan dosis 100 persen dosis anjuran. Pemberian 10 l/ha SNL pada pemupukan NPK 100 persen memberikan hasil biji dan keuntungan bersih tertinggi, yakni masing-masing 8,80 t/ha dan Rp. 6.155.000,-/ha/musim. Walaupun demikian pemberian SNL hanya menyumbang hara : 0,002 kg N; 0,003 kg P2O5; dan 0,002 kg K2O per hektar. Dengan demikian peningkatan hasil biji tersebut sangat tergantung pada kontribusi ketersediaan hara N, P, dan K dalam tanah.Field experiments aimed to study the effectiveness and nutrients contribution of SNL and SNP on maize growth were conducted at Inceptisol, in Bogor at DS 2008. The experiment consisted of 2 units, i.e. SNL and SNP, and used pioneer 21 variety of maize as plant indicator. The experiments used Randomize Complete Block Design with 8 treatments and 3 replicates. The treatments were combination of 2 factors. The first factor was rate of NPK application, i.e.: 0, 25, 50, and 100 percent of reccomendation doses based on soil analyses and the second one was the application of SNL i.e. 0 and 10 l/ha (unit I) or SNP i.e. 0 and 10 kg/ha (unit II). The results showed that application of SNL and SNP were not effective in increasing maize growth unless NPK doses > 100 percent of reccomendation doses. Application of 10 l/ha of SNL combined with 100 percent doses of NPK was effective in increasing maize growth and gave the highest grain yield (8.80 t/ha) as well as net profit (Rp. 6.155.000,-/ha/season). Nutrients contribution from the fertilizer, however, were only 0.002 kg N, 0.003 kg P2O5, and 0.002 kg K2O per hectare. Thus, increase of the yield was depending on contribution of N, P, and K availabilities from the soils.

Keragaan Varietas Inpara di Lahan Rawa Pasang Surut (Performance of Varieties Inpara in Swampland) Koesrini, Koesrini; Saleh, Muhammad; Nursyamsi, Dedi
JURNAL PANGAN Vol 22, No 3 (2013): PANGAN
Publisher : Perum BULOG

Lahan rawa pasang surut merupakan lahan marjinal tetapi memiliki potensi cukup besar untuk usahatani padi apabila dikelola dengan menerapkan teknik budidaya yang tepat. Kunci utama keberhasilan usahatani padi di lahan rawa pasang surut adalah pengelolaan air yang tepat dan pemberian hara yang seimbang pada varietas padi yang adaptif. Inpara (Inbrida padi rawa) merupakan varietas yang daya adaptasinya di lahan rawa beragam. Tujuan penelitian ini adalah untuk mengevaluasi keragaan varietas Inpara di lahan rawa pasang surut. Kegiatan dilaksanakan di Kebun Percobaan Belandean, Kabupaten Barito Kuala, Propinsi Kalimantan Selatan pada musim kemarau 2012. Tanah di lokasi pengujian tergolong tipologi lahan pasang surut sulfat masam potensial dengan tipe luapan air B. Percobaan menggunakan rancangan acak kelompok, 6 perlakuan dan 5 ulangan. Ada enam varietas padi rawa yang ditanam, yaitu Inbrida Padi Rawa (Inpara) 1, 2, 3, 4, 5 dan Margasari. Pengujian ini menunjukkan bahwa potensi lahan sulfat masam potensial dapat ditingkatkan dengan menanam varietas unggul Inpara 1, 2, 3, 4 yang produktivitasnya lebih tinggi dari varietas Margasari. Varietas Inpara 5 lebih sesuai ditanam di lahan rawa lebak. Kenaikan hasil Inpara 1, 2, 3, 4 dibandingkan varietas Margasari berturut-turut adalah 0,99, 1,39, 098, 0,98 ton GKG/ha. Kenaikan hasil varietas Inpara nyata sampai sangat nyata secara statistik.Swampy lands or wetlands are marginal lands but they have considerable potentials for rice farming. The main key solution to overcome swampy lands constraints are nutrient and water management as well as the use of adaptive rice varieties. Inparas (inbred swampy land rice) is variety released by the Indonesian Agency for Agricultural Research and Development (IAARD) which is adaptive to swampy land conditions. The purpose of this research was to evaluate the performances of Inpara varieties in tidal wetlands. The field experiment was carried out in Belandean Experiment Station, Barito Kuala District, South Kalimantan Province in the dry season of 2012. Soil of the site is classified as potential acid sulfate soil with type B overflow. The research was arranged in Randomized Completely Design, with 6 treatments and 5 replications. There were planted six swampy land varieties, i.e. Inpara 1, 2, 3, 4, 5 and Margasari. The result showed that potential acid sulfate soil could be increased by planting Inpara 1, 2, 3, and 4 which had higher yield than that of Margasari variety. Inpara 5 variety was more suitable to be planted on fresh water wetlands. The increasing yield of Inpara 1, 2, 3, and 4 compared to that of Margasari variety were 0.99, 1.39, 0.98, 0.98 ton/ha, respectively. The increasing yield of Inpara varieties was significantly different.

Populasi Mikrob di Rizosfer dan Pertumbuhan Caisim (Brassica juncea) di Tanah Dikontaminasi Insektisida Organoklorin setelah Aplikasi Konsorsia Mikrob dan Kompos Hindersah, Reginawanti; Rachman, Wahyuda; Fitriatin, Betty Natalie; Nursyamsi, Dedi
Jurnal Natur Indonesia Vol 15, No 2 (2013)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Organochlorine insecticide hed been banned for agriculture but nowadays its residue was still found in some agriculturalsoil. One of ways to lower organochlorine residue in soil is by using degrading-organochlorine microbial consortiaaccompanied by compost application. However, application of exogenous microbes might affect bacterial and fungalpopulation in soil and hence plant growth. The pot experiment has been set up to verify the influence of Pseudomonasmallei and Trichoderma sp. and compost on total bacteria and fungi on rhizosphere of caisim (Brassica juncea L.) grownon Andisols which were contaminated with organochlorine insecticide of Heptachlor, endosulfan, dieldrin, and DDT.Experimental design was Factorial Randomized Block Design with three replicates. The first factor was microbial consortiaof P.mallei and Trichoderma sp., and the second one was the kind of compost. The result showed that effect of microbialconsortia on total bacteria population was determined by the kind of compost. Total bacterial population in rhizosphere ofcaisim grown with cow manure compost and microbial consortia was more increased. However, microbial consortia as wellas any kind of compost did not influence total fungal population in caisim rhizosphere. Amount of leaf increased due tomicrobial and compost application however plant yield did not.

EFFECT OF OXALIC ACID, NA+, NH4 +, AND FE3+ ON AVAILABILITY OF SOIL K, PLANT N, P, AND K UPTAKE, AND MAIZE YIELD IN SMECTITIC SOILS NURSYAMSI, DEDI; IDRIS, K.; SABIHAM, SUPIYANDI; RACHIM, D.A; SOFYAN, AGUS
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 28 (2008): Desember 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n28.2008.%p

Smectitic soils have high prospect to be developed for agricultural land under a proper soil and plant management. The soils are commonly high in total K content. It?s availability for plant growth, however, is relatively low due to fixation by smectite in interlayer space. Researches aimed to study the effect of oxalic acid, Na+, NH4+, and Fe3+ on availability of soilK, plant N, P, and K uptake, as well as maize yield in smectitic soils have been conducted in Laboratory of Research and Soil Test and Green House of Indonesian Soil Research Institute, Bogor. Four different types of bulk soil samples taken from Bogor (Typic Hapludalfs), Cilacap (Chromic Endoaquerts), Ngawi (Typic Endoaquerts), and Blora (Typic Haplustalfs) were used for experiments. Incubation and pot experiments were set up using Factorial Randomized Completely Block Design with three replication and pot experiment used maize of Pioneer 21 variety as plant indicator. The first factor was oxalic acid rates: 0; 1,000; 2,000; and 4,000 ppm, while the second one was application of cations: without cation, Na+, NH4+, and Fe3+ from NaCl, NH4Cl, and FeCl3 respectively with 50% of maximum adsorption rate. The Fe3+ with 50% of maximum adsorption rate caused plant death, thus the experiment was repeated in the nextseason with Fe3+ rates: 0, 125, 250, 375, and 500 ppm. The results showed that oxalic acid, Na+, NH4+, and Fe3+ significantly increased the availability of soil K in both Alfisols and Vertisols where the effect was higher in Vertisols than Alfisols. The effectiveness of the treatments to release K from non available to available K form in the soils was in order of Fe3+ > NH4+ > Na+ > oxalic acid. Oxalic acid significantly increasedplant N, P, and K uptake in Vertisols, while 125 ppm of Fe3+ significantly increased plant K uptake in Alfisols as well as N, P, and K uptake in Vertisols. Oxalic acid significantly increased 4- week-after-planting biomass dry yield in Typic Hapludalfs and Typic Endoaquerts, while 125 ppm of Fe3+ significantly increased the yield in Chromic Endoaquerts and Typic Endoaquerts.

MANAGEMENT OF NUTRIENT DEFICIENCY ON INCEPTISOLS TO IMPROVE MAIZE GROWTH NURSYAMSI, DEDI; BUDIARTO, A.; ANGGRIA, L.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 20 (2002): Desember 2002
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n20.2002.%p

Maize is very prospective to be developed in upland Inceptisols if supported by proper soil management and suitable varieties. Research aimed to study nutrient limiting factors of Inceptisols for the development of maize (Zea mays L.). Research had been conducted at chemical laboratory and green house of Center for Soil and Agroclimate Research in Bogor by using soil samples taken from Sukabumi, West Java. The green house experiment utilized minus one test method with randomized block design, eleven treatments, and three replications. Maize crop of Pioner C3 variety was used as plant indicator. Parameters employed in this experiment were: (1) the dry weight of 4 week old-maize, (2) plant nutrients uptake of N, P, K, Ca, Mg, S, Zn, and Cu; and (3) soil properties analyses on soil pH H2O, Org-C, total-N, P-HCl, K-HCl, P-Bray 1, P-Olsen,exchangeable Ca, Mg, and K, CEC, exchangeable Al and H, as well as Cu and Zn-DTPA. The results showed that N, P, K, Ca, Mg, S, Cu, and Zn fertilizations increased soil N, P, K, Ca, Mg, S, Cu, and Zn contents as well as plant nutrient uptake. Fertilization of Ca (lime) decreased soil exchangeable Al and H as well as plant Al uptake. The application of rice straw increased soil organic C and CEC, and also plant nutrient uptake. N, P, and K nutrients, and organic matter were found out as the primary constraints to maize growth in Inceptisols of Sukabumi. To solve the limiting factors, the soils need to be treated with 270-300 kg urea, 240 kg SP-36, 100 kg KCl, and 3-5 tons organic matter per ha. It is recommended that urea and KCl to be applied gradually : before planting, 4 and 6 weeks after planting, respectively. SP-36 fertilizer is mixed with urea and KCl and drown into the soil before planting. Organic matter was formerly composted and mixed with the soils during land preparation.

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