土壌水分の影響を考慮した被覆肥料の溶出推定

概要

論文の詳細を見る
1) Rates of nutrient release from 4 different kinds of resin-coated compound fertilizers were measured under varying soil conditions: 40,20,10 and 5% of the maximum water holding capacity (MWHC), which corresponded to -0.1, -3.0, -40, -100MPa of the matric potential, respectively. From the nutrient release data, the release constant (k) was calculated. The k values for different coated fertilizers at 40% MWHC were similar to those previously obtained in the dissolution test, but were decreased with decreasing moisture contents. The release rate coefficient (α) was defined as the ratio of the k values of the different coated fertilizers. 2) Release rate coefficient α was expresses as a function of soil moisture potential, and incorporated into a new simulation model which successfully estimated nutrient release under different soil moisture conditions. 3) Two different kinds of coated fertilizers were embedded in the spring and autumn in soil layers at 1 and 10 cm depths in a field. The fertilizers were collected intermittently for several months, and the residual nutrients were determined. When the fertilizers were embedded at 10 cm, the release rates were influenced little by the soil moisture variation, but the release rate from the fertilizers embedded at 1 cm was delayed. The delay was marked particularly in the dry period with little rainfall. The release rates simulated with the temperature and moisture variation agreed well with the measured values, and we confirmed the validity of the simulation model.
社団法人日本土壌肥料学会の論文
2000-10-05

土壌水分の影響を考慮した被覆肥料の溶出推定

スポンサーリンク

概要

著者

関連論文

スポンサーリンク