新疆不同密度下棉花干物质积累及其分配规律研究

对新疆棉区南疆亚区中产棉田2品种3密度下干物质积累及其分配规律研究结果表明:①棉花干物质积累动态可用Logistic模型描述,随密度增加单株干物质积累降低;生育期推迟,其影响加大.②根据生长速率曲线计算出了干物质积累的主要时期.NAR在出苗后40和70d时出现高峰值,这是新疆棉区单产较高的原因之一.③2品种在中密度下,营养生长与生殖生长的并进时期较长,丰产性好的军棉1号并进生长时期>新陆中2号,它们均为中密度棉田具有较高经济产量的品种.

Study on the Dry matter Accumulation and Distribution with Various Densities in Cotton

The cotton dry-matter accumulation and its distribution with two varieties and three densities were studied.The result were as follows: (1) The process of cotton dry-matter accumulation can be simulated with logistic equation.With the density increased, the dry-matter accumulation decreased.Further more, the effect of density would become stronger if the cotton physiological stage came late.(2) With the density increased this accumumlation rate was decreased, and the key period of dry-matter accumulation was estimated by using of its rate curve.This result will provide theoretical basis for cotton-field management.(3) Dry-matter distribution in three densities showed that the together growing period between vegetative and reproductive organs in the middle density is longer so the yield in middle density is higher.