论文部分内容阅读
一看天气:除草剂一般在晴朗、气温高的天气使用效果较好。因此,早稻比晚稻的药剂用量应加大10—20％。还要掌握水田晴天施,旱地雨后施。 二看土质:土壤不同,用药量要有差异。砂土比粘土用药量应减少10％左右,因砂土粘附能力差,容易渗透,如用药量过大易产生药害。 三看苗情:幼苗抗药性比老苗强,壮苗抗药性比瘦苗强。秧田施用除草剂,一般在秧苗现青后使用为好。 四看水层:浅水层(以1寸左右)施药比深水层效果好,施后一星期不排灌。如用2,4—D
A look at the weather: Herbicide is generally used in sunny, high temperature weather is better. Therefore, the amount of early rice than late rice dosage should be increased by 10-20%. Also master the paddy field sunny Shi, dry rain after the Shi. Second look at soil quality: different soil, the dosage should be different. Sand than the clay dosage should be reduced by about 10%, due to poor adhesion of sand, easy to infiltrate, such as excessive dosage prone to injury. Three Miao Miao: seedling resistance than the old seedlings, seedlings strong resistance than thin seedlings. Seedling application of herbicides, green seedlings are generally used as well. Four to see the water layer: shallow layer (to 1 inch or so) than the deep aquifer effect, after a week without irrigation. If using 2,4-D