塩類集積土壌におけるギニアグラスの除塩効果

概要

論文の詳細を見る
We investigated that the effect of desalinization by using guinea grass in accumulated chemical fertilizer soils. Each 1/2000 a pot was filled with about 10kg of air-dried soil and chemical fertilizer. The soil was fertilized at the rate of 20kg N 10a^<-1>, 40kg P_2O_5 10a^<-1>, 20kg K_2O_10a^<-1>. This rate of fertilizer is treatment 1. Two and four times that amount of fertilizer were called treatment 2 (40kg N 10a^<-1>, 80kg P_2O_5 10a^<-1>, 40kg K_2O 10a^<-1>) and 4 (80kg N 10a^<-1>, 160kg P_2O_5 10a^<-1>, 80kg K_2O 10a^<-1>). The pot experiment was conducted at the green house under high temperature and evaporation. The seeds of guinea grass from Yukijirusi Syubyou were sown in each pot. Sampling (plant and soils) was done 0 to 9 weeks after sowing. Inorganic nitrogen, available phosphorous, water soluble bases (potassium, calcium and magnesium) in surface soil (depth 0-15cm) of 3 treatments decreased with guinea grass over the 9 weeks. Nitrogen, phosphorous and base uptake by guinea grass was highest in treatment 4. In treatment 4 (4 times the amount of fertilizer), guinea grass growth (shoot and root) was higher than in other treatments. C/N of guinea grass in treatment 1, 2 and 4 were about 20 in 9 weeks; however, this value was 8-12 over 6 weeks. It is possible to utilize guinea grass in accumulated fertilizer soil of green house, green manure and pasture plants after harvesting
社団法人日本土壌肥料学会の論文
2007-10-05