紫云英不同翻压时间对土壤养分含量及晚稻养分吸收的影响

在大田条件下,研究了在早稻移栽前,紫云英不同翻压时间对晚稻收获后土壤养分含量以及晚稻养分吸收的影响。结果表明:在早稻移栽前5~15 d翻压紫云英均有利于提高土壤中全N含量以及有效N、P和K含量,但是对土壤中全P、全K含量影响不显著。在移栽前5 d翻压紫云英,晚稻茎秆和籽粒中N、P含量和晚稻产量有所下降;在移栽前10~15 d翻压紫云英,可以显著增加茎秆和籽粒中N、P、K含量,并提高晚稻产量,以在移栽前15 d翻压紫云英的效果最好。

Effects of Different Applying Times of Astragalus sinicus on Soil Nutrient Content and Nutrient Absorption of Late Rice Plants

A field experiment was carried out to study the effects of different applying times of Chinese milk vetch(Astragalus sinicus) on the content of soil nutrient after the harvest of late rice and the nutrient absorption of late rice plants.The results showed that turning A.sinicus to underground on the 5th～15th day before transplanting early rice plants could increase the content of total N,available N,available P and available K in the soil,but it had no significant effects on the content of total P and total K in the soil.Turning A.sinicus to underground on the 5th day before transplanting early rice plants could decrease the content of N and P in the stalk and grain of late rice as well as the yield of late rice.Turning A.sinicus to underground 10～15 days before transplanting early rice plants could significantly increase the content of N,P and K in the stalk and grain of late rice,and enhance the yield of late rice.Therefore,turning A.sinicus to underground on the 15th day before transplanting early rice plants had the best effects.