湖州市毛竹笋用林土壤氮磷钾供应水平及对策

通过土壤全氮、速效磷和速效钾的测定和竹笋产量的调查,发现①浙江湖州市毛竹笋用林土壤的全氮和速效磷供应水平相对于农业土壤来说是比较低的,故通过施用氮肥和磷肥,竹笋的增产潜力还会得到较大的发挥。②在土壤全氮和速效磷供应水平较低的情况下,竹笋年产量2/(kg/hm~2)的高低与土壤速效钾含量x(mg/kg)有直接的关系,大体上可用方程y=-9568.25 498.40x-1.85x~2表示,相关系数r=0.746.③当土壤速效钾含量M低于71mg/kg时,应配合氮、磷施用钾肥。速效钾肥的最低施用量M′(kg/hm~2)可按M′=630-9M确定。

Moso Bamboo Shoot-producing Stands in Huzhou City: Supply Situations of Nitrogen Phosphorus Potassium in the Soil and Strategies Fertilizer Applied.

This article analyses the relationship between soil nutrients and moso bamboo shoot yield and suggests the measures of raising bamboo shoot yield. 1. Because both supply levels of total nitrogen and rapidly available phosphorus in the soil are quite low, the potential of raising bamboo shoot yield is probably great by means of supplying nitrogen and phosphoric fertilizers. 2. The annual yield y (kg/hm2) of bamboo shoots relates to the content x (mg/kg) of rapidly available potassium: y=- 9 568.25 498.40x -1.85x2, r = 0.764. 3. When the content (M) of rapidly available potassium in the soil is under 71 mg/kg, the soil should be supplied rapidiy available potassium (M') according to the model: M' = 630-9M.