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B H Purwanto
UGM
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Comparison of two kinetics models for estimating N mineralization affected by different quality of organic matter in Typic Hapludults Wijanarko, A; Purwanto, B H
Journal of Degraded and Mining Lands Management Vol. 3 No. 3 (2016)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2016.033.577

Abstract

N availability in the soil is determined by the rate of mineralization. N mineralization can be estimated using several models. Aim of research is  to compare of two kinetics models for estimating N mineralization affected by different inputs of  organic matter and soil fertility in Typic Hapludults. Research used completely randomized design with two factors. The first factor was land use : (1). Soil from land cultivated by cassava crops for less than 10 years, and (2). Soil from land cultivated by cassava crops for more than 30 years. The second factor was type of organic matter: (1). Groundnut biomass, (2). Maize biomass, (3). Groundnut-maize biomass, with ratio of 1:1, (4). Groundnut – maize biomass, with ratio of 2:1, (5). Groundnut – maize biomass, with ratio of 1:2, and (6). Without organic matter.  The result shows that based on the value of R2, first-order kinetics equation is more suitable to decribe N mineralization than double-pool kinetics equation because R-square value higher than double-pool kinetics and is positively correlated with N mineralization parameters (N0, k and N0.k).
N, P and K storage efficiency on degraded peat soil through ameliorant application Maftu'ah, E; Ma'as, A; Purwanto, B H
Journal of Degraded and Mining Lands Management Vol. 1 No. 4 (2014)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2014.014.187

Abstract

The availability of nutrients, especially N, P, K in the degraded peat are very low. The high organic acids can decrease the soil pH, its causes the negatively charged nutrients such as nitrate and phosphate are also very low. Ameliorant contributes some cations both monovalent and polivalent which acts as a bridge cations, thus increasing the availability of nutrients, especially nitrogen and phosphate. The objective of research was to determine the storage efficiency of N, P, K on application of some ameliorants on degraded peat land. The experiment was conducted at the laboratory of ISARI, Banjarbaru. Peat soil collected from the degraded peat land at Kalampangan, Central Kalimantan. The treatments were 8 ameliorant formula and two control treatments (+NPK and -NPK). The treatments were arranged in CRD, with 3 replications, And using soil coloum (lysimeter). The leaching was conducted every once a week, with 1.25 liter of aquades and the volume of leachate would be recorded. N, P, K concentration in leachate were analyzed periodically at 1, 2, 4, 6, and 8 weeks after incubation. The results showed that the concentrations of N and K on each observation time were relatively same, but P increased significantly at 4 weeks after incubation. The highest concentrations of N, P, and K in leachate were ameliorant from 100% of chicken manure. The storage efficiency of N, P and K varied depending on the type of ameliorant. Ameliorant that improved storage efficiency of N and K was ameliorant which consist of 80% agricultural weed + 20% dolomite, whereas for P efficiency storage was on ameliorant which consist of 80% Chinese water chestnut (Eleocharis dulcis) + 20% dolomite.
Co-Authors A Wijanarko, A Ma'as, A Maftu'ah, E