玉米不同水肥耦合方式下氮肥肥效滞后时间研究

研究了玉米对氮肥施用后的肥效反应时间,以期实现玉米高产精准施肥.结果表明：随施氮肥方式的不同,施肥后8～11d玉米叶片性状才会表现出肥料效果的发生,其中以氮肥表施的滞后时间最长,氮肥施后覆土次之,氮肥兑水施用的肥效滞后时间最短;玉米叶片性状的叶长、叶宽、生长速率及叶绿素含量指标中,叶绿素含量指标反应时间为8～11d、叶片生长速率指标为10～13d、叶长指标为11～14d,叶宽为11～15d,通过叶绿素仪测定叶绿素是确定肥料发生时间较好的方法,而通过叶片外观性状诊断较为迟缓.

Study on Lag Time of Fertilizer Efficiency of Maize under Different Water and Fertilizer Coupling Modes

For guide the precise fertilization on maize, lag time of fertilizer response to maize was studied. The results showed that fertilizer effect the leaves of maize after 8~11 days under the different nitrogen fertilizer application, lag time of nitrogen fertilizer applied on surface of soil was longest, lag time of soil covered nitrogen fertilizer method was the second, lag time of nitrogen fertilizer dissolved into water was the shortest; the response time of leaf chlorophyll content , leaf growth rate, leaf length, leaf width were 8~11 days, 10~13 days, 11~14 days, and 11~15 days, respectively. So leaf chlorophyll content de- termination was the best method for judge the fertilizer occure time , the agricultural traits observation was slowly.