氮磷肥配合施用对桑树生长和桑叶产量的影响

在大田条件下研究了不同氮、磷肥施用水平对桑树生长和桑叶产量的影响。结果表明,氮磷肥适合用量配比能明显促进桑树生长,桑树每株枝条数、枝条长和枝条基部径围及桑叶百叶重均明显随氮肥和磷肥用量提高而增加。结果显示在氮肥用量为450kg/hm2时,N∶P2O5施用比例为3∶1时桑叶产量最高,在各种氮磷肥用量组合中,N450P150处理的桑叶产量比其他处理平均高5139kg/hm2,增产率达22.4%。试验结果表明,氮、磷肥对桑叶增产效果有互促作用,即高量氮肥施用需要有足够的磷肥施用才能充分发挥其增产效果,反之亦然。

Effect of N and P combined fertilization on growth and leaf yield of mulberry

A field trial was carried out to study the influence of nitrogen (N) and phosphorus (P) combined fertilization to mulberry growth and leaf yield.The results showed that suitable N and P application rate ratio significantly improved mulberry growth.Branch number,branch length and diameter increased with N and P application rate increase.It was showed that treatment N_(450)P_(150) harvested the highest leaf yield with more 5139 kg/hm~2 than other treatments and increased yield by 22.4%.The result indicated that the optimum NP_2O_5 application ratio was 31 at N rate of 450 kg/hm~2.The study demonstrated that there was positive interaction between N and P on mulberry leaf yield and high N applied rate need adequate P application.