Some Fundamental Studies on the Weed Control by Herbicide CAT in Barley and Wheat Cultivations

[摘要] It was made an attempt to know the safe and effective method of utilizing herbicide CAT in barley and wheat cultivations. 1.) The pot tests were carried out to investigate the circumstances of movement of t he chemical under various conditions combining several kinds of soil and amounts of rainfall, where the seedlings of rape and wheat were used as test plants. It was made clear that the chemical moved into the soil 3 cm depth from the surface, under the condition which had 20 mm rainfall on Nagano loam with a little water capacity and humus content. Some matters that demand special attention for use of the chemical were pointed out from this fact. 2) Differences were found on the germination phases in Alopecurus aequalis var. amurensis between the plants grown on plowed and non-plowed paddy fields. On the plowed paddy fields, plants can emerge easily from the deep parts under the ground. As it causes the growing of numerous number of weeds on the plowed paddy fields, othet suitable means togethet with the chemical should be adopted to weed control in such case. 3) The interrelation between the growing stages of wheat or Alopecurus aequalis var. amurensis and the chemical injuries was investigated. The chemical injury is raised in an early stage when the plants have not attained the leaf number of 2.5. Therefore, the attention should be paid for the growing stage when the chemical is used.

[学科分类] 农业科学（综合）