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Soil potassium adsorption at several shallot center areas, Brebes Regency, Central Java Province Arief Hartono; Desi Nadalia; Bambang Hendro Trisasongko
Journal of Degraded and Mining Lands Management Vol 10, No 4 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.104.4737

Brebes Regency, Central Java, is one of Indonesia's most important shallot production center implementing intensive agriculture. In the bulb production, K is needed more than other nutrients. This study aimed to assess and describe the adsorption characteristics of K on the soils of the shallot farming system in Brebes District, Central Java. Soil samples were collected at several locations in the shallot center areas of Brebes Regency, Central Java Province. The observed soil properties included pH H2O, EC, soil texture, organic C, potential-K, exchangeable Ca, Mg, Na, and K, CEC, exchangeable Al and H, and water-soluble K. K adsorption was simulated by the Freundlich equation. The proportion of K from low to high of retention energy in the soil studied had the order, namely water-soluble K<exchangeable K<potential-K. The K adsorption result showed that the soil had a high capacity to adsorb K. It indicated that added K was accumulated in the soil. The high capacity to adsorb K indicated that K accumulated in Brebes with continuous K fertilization. This research recommended that to increase the efficiency of K fertilizer, it is necessary to introduce the technology to mine K in Brebes soils like bacteria capable of dissolving K or biofertilizers.

Soil potassium adsorption at several shallot center areas, Brebes Regency, Central Java Province Arief Hartono; Desi Nadalia; Bambang Hendro Trisasongko
Journal of Degraded and Mining Lands Management Vol. 10 No. 4 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.104.4737

Brebes Regency, Central Java, is one of Indonesia's most important shallot production center implementing intensive agriculture. In the bulb production, K is needed more than other nutrients. This study aimed to assess and describe the adsorption characteristics of K on the soils of the shallot farming system in Brebes District, Central Java. Soil samples were collected at several locations in the shallot center areas of Brebes Regency, Central Java Province. The observed soil properties included pH H2O, EC, soil texture, organic C, potential-K, exchangeable Ca, Mg, Na, and K, CEC, exchangeable Al and H, and water-soluble K. K adsorption was simulated by the Freundlich equation. The proportion of K from low to high of retention energy in the soil studied had the order, namely water-soluble K<exchangeable K<potential-K. The K adsorption result showed that the soil had a high capacity to adsorb K. It indicated that added K was accumulated in the soil. The high capacity to adsorb K indicated that K accumulated in Brebes with continuous K fertilization. This research recommended that to increase the efficiency of K fertilizer, it is necessary to introduce the technology to mine K in Brebes soils like bacteria capable of dissolving K or biofertilizers.

Penentuan Batas Kritis Fosfor untuk Pertumbuhan Bawang Merah di Kabupaten Brebes, Jawa Tengah Nadalia, Desi; Sulistiono, Muhammad Ramadhan Fauzi; Hartono, Arief
Jurnal Ilmu Tanah dan Lingkungan Vol 26 No 1 (2024): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.26.1.40-47

Intensifikasi pemupukan yang berimbang merupakan salah satu cara untuk meningkatkan mutu bawang merah dan produksi guna memenuhi permintaan pasar. Guna mencapai hasil panen yang optimal, ketersediaan fosfor (P) tanah harus berada di atas tingkat kritis. Penelitian ini bertujuan untuk menentukan batas kritis hara P dan menentukan pengekstrak terbaik di antara Bray 1, Olsen, Mehlich I, dan HCl 25% serta mengevaluasi pengaruh pemupukan P terhadap pertumbuhan tanaman bawang merah di Kabupaten Brebes, Jawa Tengah. Penentuan batas kritis P di tanah dilakukan dengan mengekstrak P tanah dari 16 lokasi yang tersebar di Kabupaten Brebes. Pemupukan P dilakukan dengan pemberian larutan KH2PO4 sebanyak 0, ½X, X, dan 2X dimana X adalah dosis pupuk P anjuran dalam bentuk P2O5sebesar 120 kg ha-1. Tanaman dipanen biomasanya berumur enam minggu setelah tanam. Batas kritis P tanah ditetapkan menggunakan metode Cate dan Nelson. Hasil penelitian menunjukkan bahwa setiap ekstraksi P memiliki nilai koefisien korelasi berbeda yang dipengaruhi oleh pengekstraknya. Koefisien korelasi antara kandungan hara P tanah yang diekstrak menggunakan metode Bray 1, Olsen, Mehlich I, dan HCl 25% dengan bobot kering tanaman berturut-turut adalah 0,630, 0,341, 0,821, dan -0.089. Nilai korelasi untuk metode Bray 1 dan Mehlich 1 dengan bobot kering tanaman secara statistik berturut-turut nyata dan sangat nyata. Batas kritis kandungan P tanah untuk mencapai 90% produksi relatif bawang merah di kabupaten Brebes tersebut berdasarkan metode Bray 1 dan Mehlich 1 yaitu 40 ppm P. Pengekstrak P tanah di Brebes yang paling baik adalah Mehlich 1. Pemupukan disarankan pada tanah-tanah dengan kadar P tanah kurang atau sama dengan 40 ppm P.

Critical Level Determination of Phosphorus for Big Red Chili (Capsicum annuum L.) Growth on Soil in Java Island Hartono, Arief; Nadalia, Desi; Khuluq, Siti Lathifah Husnul
Jurnal Hortikultura Indonesia (JHI) Vol. 10 No. 3 (2019): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Salah satu upaya yang dapat dilakukan agar pemupukan fosfor (P) sesuai dengan kebutuhan tanaman cabai merah besar ialah dengan melakukan analisis tanah serta menentukan batas kritis P di tanah yang dihubungkan dengan produksi. Tujuan dari penelitian ini adalah menentukan batas kritis P di tanah untuk tanaman cabe merah besar di Pulau Jawa. Contoh tanah diambil dari 19 lokasi yang tersebar di Pulau Jawa. Analisis P tanah sebelum tanam dilakukan dengan tiga metode ekstraksi P yaitu Bray 1, Olsen, dan Mehlich III. Setelah analisis P tanah, bibit cabe merah besar ditanam dalam pot yang berisi 500 g tanah berat kering mutlak untuk tiap lokasi dan tiap lokasi mempunyai 4 dosis pemupukan. Dosis pemupukan P terdiri dari 0, 55, 110, dan 220 kg ha-1 P2O5. Sebagai pupuk dasar juga diberikan pupuk urea dan KCl masing-masing dengan dosis 110 kg ha-1 dan 180 kg ha-1. Tiap tanaman dipanen biomassanya setelah berumur 4 minggu setelah tanam. Pengaruh pupuk P terhadap parameter pertumbuhan tanaman dievaluasi menggunakan analisis ragam. Batas kritis P tanah ditetapkan dengan metode Cate dan Nelson. Hasil menunjukkan bahwa pemberian pupuk P berpengaruh nyata terhadap tinggi tanaman, bobot basah dan bobot kering tanaman. Pemupukan 220 kg ha-1 P2O5 memberikan respon tertinggi terhadap parameter pertumbuhan tanaman. Hasil uji korelasi menunjukkan bahwa ketiga metode ekstraksi P tersebut berkorelasi positif dan nyata dengan bobot kering tanaman. Metode ekstraksi Olsen memiliki korelasi tertinggi dengan bobot kering tanaman (r = 0.665). Batas kritis P dalam tanah untuk tanaman cabai merah besar di pulau Jawa berdasarkan metode ekstraksi Bray 1, Olsen, dan Mehlich III masing-masing ialah 15 ppm, 40 ppm, dan 50 ppm. Kata kunci: analisis tanah, Bray 1, Cate dan Nelson, Mehlich, metode ekstraksi, Olsen

Sosialisasi Budidaya Padi Organik Dataran Tinggi di Kabupaten Tasikmalaya Nadalia, Desi; Yayat Hidayat; Wahyu Purwakusuma
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 10 No. 1 (2024): Agrokreatif Jurnal Ilmiah Pengabdian Kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.10.1.51-58

The development of organic rice has long been echoed in Indonesia as a sustainable agriculture system to produce healthy food and be environmentally friendly. The lower productivity of organic rice compared to conventional rice, less competitive marketing of organic rice, and limited availability of organic fertilizers in the field are the main reasons for the low adoption and development of organic rice by farmers, such as in the upland organic rice development area in Cipatujah, Tasikmalaya Regency. Socialization of organic rice cultivation techniques through organic fertilizer field schools and organic rice technical culture demonstration plots are efforts to increase farmers' adoption of organic rice. The field school is focused on making good quality organic fertilizer formulations in solid and liquid forms. In contrast, the organic rice cultivation demonstration plot aims to determine the dose of organic fertilizer to support optimal growth and productivity of organic rice plants. The solid organic fertilizer formulation produces good quality organic fertilizer with a pH of 8,54-8,71, C-organic content of 27,87-28,63%, C/N ratio of 18,96 – 21,60, and macronutrient contents (N+P2O5+K2O) of 4,67 – 5,13%. Liquid organic fertilizer (LOF) formulations have not produced excellent quality LOF, primarily related to the low pH (pH <4) and low macronutrient contents (N+P2O5+K2O) of 0,49-2,16%. The growth of organic rice plants with a dose of 3 tons/ha (organic rice I) and 6 tons/ha (organic rice II) is slower than conventional rice (chemical fertilizer). At the same time, plant growth of organic rice III (dose 9 tons/ha) was better than conventional rice in terms of number of tillers and plant height.

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