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Riyanto, Damasus
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Agriculture, Biological Sciences & Forestry Environmental Science

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Journal : Journal of Tropical Soils

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Soil Fertility Properties and Rice Biomass Production Under Three Rice Farming Systems at Vertisols Sambung Macan Sub District, Sragen Regency Sukristiyonubowo, .; Riyanto, Damasus; Widodo, Sugeng
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.17-23

Abstract

The farmers realize that green revolution technology with high inputs is no longer sustainable. They want to move to other rice farming systems. The aim of research was to study soil chemical-physical characteristics and rice productions under  three  rice farming systems. This study was conducted in Vertisols at Sambung Macan Sub District, Sragen Regency, arranged in a randomized complete block design with three replications and as the treatments was an organic, semi organic and conventional rice systems. One kilo gram composites soil  samples of 0-20 cm in depth were collected from five random sampling points of every site and taken in March 2017, before soil preparation. Rice biomass productions namely rice grains, rice straw and rice residues were harvested in the end of June 2017. The results indicated that in organic field, the soil chemical-physical fertility was superior to that of in semi organic and conventional and semi organic system was better than conventional in terms of soil pH, organic C and total N, P and K total, soil bulk density, particle density, soil porosity and permeability. Similar finding was observed for rice biomass productions. The rice grains yields were 7.53 ± 0.85, 6.60 ± 0.15 and 5.77 ± 0.71, rice straw were 7.97 ± 0.47, 7.63 ± 0.21 and 6.93 ± 0.25 and forrice residues were 4.20 ± 0.10, 3.30 ± 0.20 and 3.25 ± 0.35 Mgs ha-1 season-1 in organic, semi organic and conventional systems, respectively.Compared to the conventional system, the organic increased about 31 %, 15% and 29 % for rice grains, rice straw and rice residues, respectively. Comparing semi organic to conventional, the improvement was 14 %, 10 % and 2 % for rice grains, rice straw and rice residues, respectively. This short term research concluded that organic rice farming was superior to both semi organic and conventional systems, but the long term effect of organic need to be further evaluated.
Study on Nutrient Balances of Newly Developed Lowland Rice Fields at Kleseleon Village, Malaka District, Nusa Tenggara Timur -, Sukristiyonubowo -; Riyanto, Damasus
JOURNAL OF TROPICAL SOILS Vol. 25 No. 3: September 2020
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2020.v25i3.137-145

Abstract

The land allocated for newly opened lowland rice can be from ultisols, oxisols, inceptisols, and potential acid sulfate soils. The study was aimed to evaluate nitrogen (N), phosphorous (P), and potassium (K) inputs – outputs of newly developed lowland rice under different treatments and to validate the N, P, and K recommended applications rate according to N, P, and K balances. The study was conducted in Kleseleon village, Malaka District. Five treatments were tested namely T0: farmers practices, T1: NPK at recommendation rate + Rice straw compost, T2: NPK at recommendation rate + Smart + Rice straw compost, T3: ¾ NPK at recommendation rate + Smart + Rice straw compost, and T4: NPK at recommendation rate + Smart + Rice straw compost. The treatments were arranged in a randomized complete block design with three replications. The nutrient balances were constructed according to the difference between nutrient inputs and losses. The results indicated that there were surplus N, P, and K across the treatments and more than adequate to replace N, P, and K removed by harvest products. The suggested N, P, and K application rates were 100 kg urea, 100 kg SP-36, and 100 kg KCl with the addition of compost 3 Mg ha-1 season-1.
Co-Authors -, Sukristiyonubowo - . SUKRISTIYONUBOWO Arif Anshori, Arif Reki Hendrata Sugeng Widodo