紫色土甜橙矿质营养的研究

A STUDY ON MINERAL NUTRITION FOR SWEET ORANGE (Citrus sinensis(L.)Osbesk)TREES ON PURPLE SOIL

在中性紫色土上,甜橙生长结果期NK 肥配施能促进植株良好生长发育,显著提高产量,对改善果实品质,提高果实的贮藏性亦有一定的作用。7年生枳砧锦橙按NK 肥1:0.75即N400克、K_2O300克配施,植株营养水平较稳定。单施N 降低了对P,K 及B 等元素的吸收,单施K 抑制了Mg,Mn 元素的吸收。配施磷肥的效果不显著。

Application of potassium combined with nitrogen to sweet orangetrees at the flowering and fruit-bearing stage on a neutral purple soilpromoted growth and yield of the plants and quality and storage life ofthe fruit harvested.Phosphate application showed little effect.Leafanalysis demonstrated that the plant nutrition level remained relativelystabe in the treatment where N and K were applied at 400g N and 300gK_2O/tree/year,respectively,to seven-year-old trees on a Poncirustrifoliata rootstock (N∶K=1∶0.75).Application of N alone withoutother elements reduced the uptake of P,K and B,whereas K applicationalone inhibited the absorption of Mg and Mn.