施磷对棉花根系形态及其对磷吸收的影响

通过盆栽试验，研究了不同施磷量和相同磷量及不同磷量施在不同比例的土体中对棉花根系形态及其对磷素吸收的影响。结果表明，磷对棉花根系具有刺激作用，施磷后使棉花根系长度、根表面积和根密度增大，吸磷量增多，从而促进了棉花的生长。当磷肥施入部分土体时，其对棉花根系生长的促进作用可以用Y=X0.72来表示。

EFFECT OF PHOSPHORUS PLACED IN SOIL ON ROOT SYSTEM MORPHOLOGY OF COTTON AND P UPTAKE

Crop phosphorus uptake is influenced by the rate of soil P supply. Soil P supply to crop depends on root system morphology: root length. root surface area, root density and so on, meanwhile also depends on kinetics of root absorption phosPhorus- Rate of soil supply P can be changed when adding P fiertilizer in soil, so that it caused crop root System morphology and P uptake change. This program from three parts studied effect of P placed on root system morphology and P uptake: (1) Effect of different P rates placed in soil on cotton root system morphology and P uptuke. (2) Effect of one P rate placed in different soil volumes on cotton root system morphology and P uptake. (3) Effect of different P rates placed in different soil volumes on cotton root system morphology and P uptake. The research has shown that length. surface area of cotton root and P uptake by root area increased when P placed in soil. so make cotton growth greater. When P fertilizer placed in part volumes soil, P stimulated cotton root growth that grew in soil of P-treatment. this can be described by the relation. Y-X^0.72 where Y is the proportion of roots in soil of P placed, X is the fractional volume