Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

0.444

P-Index

This Author published in this journals

All Journal Journal of Tropical Soils Journal of Degraded and Mining Lands Management Jurnal Solum Agricultural Revolution Journal

Darfis, Irwan

Jurusan Tanah Faperta Unand

Author-ID : 1418911

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Control & Systems Engineering Environmental Science Materials Science & Nanotechnology

Published : 6 Documents Claim Missing Document

Claim Missing Document

Articles

Title

EFEK SISA DAN TAMBAHAN TITONIA TERHADAP SIFAT KIMIA ULTISOL DAN HASIL TANAMAN jagung PADA MUSIM TANAM KE TIGA Nurhajati Hakim; Irwan Darfis; Lia Arfania
Jurnal Solum Vol 4, No 1 (2007): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Last researchers reported that Tithonia diversifolia (Mexican sunflower) could replace 25% to 50% of N and K of commercial fertilizer applied in chili production on the first and second planting time in the Ultisols of West Sumatra. A Continuation field experiments was conducted to find out the the appropriate NK cobination sources should be added on the third season to get the higest yield of maize. The treatments were the combination of NK T. diversifolia + NK commercial fertilizer which is maize needed. There were 9 treatmens such as A(0%+0%); B(0%+0%); C(50%+25%); D (50%+25%); E(25%+75%); F(25%+75%); G(50%%+50%); H(50%%+50%); and Control (0+100%). The results showed that integrated use 50% NK from tithonia with 25% NK from commercial fertilizer is the appropriate NK combination to get the higest yield (5ton ha-1)of maize on the third season in Ultisols, if on the first season for chili planting time have reseived as 50% + 50% and on the second season for chili planting as much 25%+75% NK from titonia and NK from commercial fertilizerKey Words : Ultisols, tithonia, corn

Perbaikan Sifat Kimia Oxisol dengan Pemberian Bahan Humat dan Pupuk P untuk Meningkatkan Serapan Hara dan Produksi Tanaman Jagung (Zea mays, L.) Herviyanti Herviyanti; Chici Anche; Gusnidar Gusnidar; Irwan Darfis
Jurnal Solum Vol 9, No 2 (2012): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

A research was carried out at glass house and at Soil Laboratory of Faculty of Agriculture, Andalas University Padang. The experiment was aimed to determine the interaction between humic material from compost and P fertilizer on some chemical properties of Oxisol, nutrient uptake and corn production. This experiment consisted of 2 factors (4 x 4) with three replications which were allocated in completely randomized design (CRD). The first factor was humic material having 4 doses (0, 400, 800, and 1200 ppm) and the 2nd factor was P fertilizer having 4 doses (100%, 75%, 50%, and 25% of recomendation (R)). The result showed that there was : 1) Interaction between humic materials and P fertilizer for the quality the corn seeds. Application of 800 ppm humic material improved the quality of the seeds even though at low level of P fertilizer. 2) Then, it also increased availability of P by 23.03 ppm, N total by 0.09 %, and decreased Al-exch by 0.53 me (100 g)-1 and Fe-exch by 25.62 ppm compared to threatment without application of humic material. Likewise, nutrients (N and P) uptake by plant also increased by 0.28 and 0.03 %, respectively. 3) Application of P fertilizer at 75 % R increased soil P availability by 3.77 ppm, N and P content of plant by 0.43 % and 0.06 %, and seed weight by 13.20 g and decreased Fe-exch by 21.16 ppm, compared to 25 % R of P fertilizer.Keywords : humic material, P- fertilizer, nutrient uptake

PENGARUH TANAMAN PENUTUP TANAH DAN BERBAGAI UMUR TANAMAN SAWIT TERHADAP KESUBURAN TANAH ULTISOL DI KABUPATEN DHARMASRAYA Syafrimen Yasin; Irwan Darfis; Ade Candra
Jurnal Solum Vol 3, No 1 (2006): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

This research was aimed to evaluate fertility level of soils under different oil palm ages and the management system. This was needed to determine when oil palm and the cover crops could give the best performance in protecting soil fertility level. Lan use types studied were divided into six groups. Those were A = palm oil plantation having cover crops at 3 years old, B = palm oil plantation having cover crops at 6 years old, C = palm oil plantation without having cover crops at 6 years old, D = palm oil plantation having cover crops at 8 years old, E = palm oil plantation without having cover crops at 8 years old, F = forest ecosystem. The result showed that based on the soil bulk volume (BV) and the soil organic matter content, deforestration for oil palm plantation did not significantly decrease soil fertility status. Soil fertility level under palm oil plantation having cover crops was better than that under palm oil plantation having no cover crops. The highest soil fertility level among the land use tested was found under palm oil plantation having cover crops at six ears old. This was proved by OC content (2.21%), N, P, K content (0.12 %, 23.92 ppm dan 0.325 me/100 g, respectively) which were comparable those of forest land use. Forest had OC = 2.31 %, N = 0.11 %, P = 17.86 ppm, and K = dan 0,33 me/100 g. While, on the other hand, the bulk volume was 1.01 g/cm3 which was lower than that under other oil palm plantation. Key Words: Tanaman Penutup Tanah, Kesuburan Tanah, Kelapa Sawit

Co-Authors . DARMAWAN Ade Candra Amsar Maulana Asmar, . Benito Heru Purwanto Chici Anche Darusman Darusman Dewi Rezki Gusnidar, G Herviyanti Herviyanti Kyuma, Kazutake Lia Arfania Masunaga, Tsugiyuki Maulana, Amsar Nurhajati Hakim Syafrimen Yasin Tanjung, Ellsya Tatalia Augustin Putri Teguh Budi Prasetyo Wakatsuki, Toshiyuki Zahlul Ikhsan

Title Search

Found 3 Documents Search Journal : Jurnal Solum

Abstract

Abstract

Abstract

Title

Found 3 Documents
Search
Journal : Jurnal Solum