啤酒大麦施用磷酸一铵的残效研究

Residual Effect of Monoammonium phosphate Applied to Malting Barley on Afterreap Crops

本文通过田间小区3茬定位试验研究了啤酒大麦施用磷酸一铵的残留效果。结果指出，第1茬啤酒大麦施用的磷对第2茬棉花和第3茬啤酒大麦都有一定的残效，且前茬施磷量越大残效越明显。当第1茬啤酒大麦亩施磷量达到5．86kgP2O5时，第2茬棉花可以不施磷。

plot tests were conducted for three continuous crops to study the residual effect of monoamonium phosphate (MAP) applied to malting barley on afterreap crops. The results indicat ed that the residual effect of MAP showed high on the second crop (cotton) and the third crop (malting barley), and the higher mount of MAP was applied, the more obvious the residual effect it showed. If the mount of MAP applied to the first crop(malting barley) reached 5. 86kgP2O5/ mu, it needn' t to apply any phosphate fertilizer to the second crop (cotton).