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Prediction Study of Weed Seedbank Dynamics for Weed Control without Herbicides Application

不使用除草剂控制杂草的杂草种子库动态预测研究

基本信息

批准号：
10660042
负责人：
SAGO Ryuichi
金额：
$ 2.24万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660042/
关键词：
Seedbank in soil seedbank dynamics herbicide weed management weed competition rice yield 防除予測水田雑草雑草発生診断雑草防除

项目摘要

More than 30years have passed since a herbicides effective for annual weeds was used to control weeds in Japan. Recently, we can find the paddy rice fields where are few annual weeds and decrease the number of weed seeds in soil after application of effective herbicides. A potential use of seedbank information in weed management is the use of models that incorporate seedbank dynamics and prediction of weed emergence into the decision making process.In 1998, I tried to estimate the seed density in soil based on the number of seedlings emerging from paddy soil samples collected from 25 paddy fields. At first, we make sure of the tendency toward the seedbank change of the rice field. When herbicides were applied consecutively, the seedbank decreased 12.7% per year at the rice field. Where the seed contained more than 30,000 in plow layer soil. And the decreased rate was 12.7〜2.3% per year in the rice field contained less than 30,000 seeds in plow layer soil.In 1999, I conducted to clear the weed competion in rice cultivation and to define precisely the number of weed seedbank in soil. And I proved that the loss of grain yield was under 10% in rice plow layer soil contained less than 34,000/mィイD12ィエD1 of weed seeds. We will be able to develop the computerized decision -aid software to predict the economic weed management from these results

日本使用一年生杂草除草剂防治杂草已有30多年的历史。近年来，我们发现稻田一年生杂草很少，施用有效的除草剂后，土壤中杂草种子的数量减少。种子库信息在杂草管理中的一个潜在用途是使用模型，将种子库动态和杂草出现的预测纳入决策过程中，在1998年，我试图估计种子密度的基础上出现的水稻土样品从25个稻田的种子密度。首先，我们确定了稻田种子库变化的趋势。连续施用除草剂，稻田种子库每年减少12.7%。其中耕层土壤中的种子含量超过30,000。1999年，我进行了水稻栽培中杂草竞争的研究，并对土壤中杂草种子库数量进行了精确界定。并证明了水稻耕层土壤中杂草种子含量低于34,000粒/m ~ 2·d ~（12）·d ~（1）时，水稻产量损失在10%以下。根据这些结果，我们将能够开发计算机辅助决策软件来预测杂草的经济管理