论文部分内容阅读
小麦的根外追肥是将肥料施在地上部的植株体上,由小麦地上的叶、茎等营养器直接吸收利用的一种施肥方式。目前,作为根外追肥的肥料很多,在小麦上施用的主要有:尿素、磷酸二氢钾、草木灰、过磷酸钙、硫酸钾及一些微肥如硫酸锌等。根外追肥应注意以下几点:(一)选择好肥料种类。在小麦生长的中后期需肥量急剧增加,拨节至孕穗期对氮肥的吸收达到高峰,吸收量占总吸收量氮为37.3%;对磷钾的吸
Top-dressing of wheat is the application of fertilizers on the plants above the ground, by the wheat leaves on the ground, stems and other nutrients directly absorbed by the use of a fertilization. Currently, there are many fertilizers that are topdressing on the outside of the root. Major applications on wheat include urea, potassium dihydrogen phosphate, ash, superphosphate, potassium sulfate and some trace elements such as zinc sulfate. Top dressing should pay attention to the following points: (A) choose a good type of fertilizer. In the middle and late stages of wheat growth, the amount of fertilizer required increased sharply, and the nitrogen uptake reached the peak at the diallel to booting stage, with the absorption amount accounting for 37.3% of the total nitrogen uptake.