熟畑化過程における雑草植生の変遷に関する研究 : 第8報焼畑農法における雑草植生の変化

概要

論文の詳細を見る
Buckwheat, japanese millet, red beans and soybeans in the first experiment, and buckwheat, italian millet, taro and soybeans in the second experiment, were successively sown in different crop sequences during four years without soil cultivation and fertilization on a bare field after cutting off trees and burning off vegetation. Grop yields, chemical properties of soil and change in weed vegetation were investigated. Considerable differences were observed in the total yields of crops among the different crop sequences. The highest yields were obtained at the plots where japanese millet→red beans→soybeans→buck-wheat (400 kg per 10a as the total of four years) and italian millet→taro→soybeans→buckwheat (1,383kg) were cultivated in this order. In all of the plots, number of species, population and total weight of weeds were small in the first year, but since the second year, these values increased, especially after the cultivation of japanese or italian millet. On the other hand, soil pH, base exchange acidity and saturation degree of base remarkably decreased in the year when japanese or italian millet was cultivated. Weed invasion occurred after the cultivation of millets was seemed to have resulted from the deterioration of chemical properties of soil.
日本雑草学会の論文
1979-08-25