杂种棉养分吸收、光合物质生产特性的研究

A Study on the Nutrient Absorption and Characteristic of Dry-matter Production in Hybrid Cotton (G.hirsutum L.)

通过对杂种棉川杂4号及其亲本养分吸收、光合物质生产特性的初步研究表明:棉株对氮、磷、钾的吸收均呈 Logistic 曲线,但三者吸收速度并不同步,养分吸收强度最大时期在初花期至盛铃期(30/6～28/7),此期吸收了约养分总量的60%;川杂4号的养分净积累量在各吸收期均较高,其养分吸收强度优势在初花期至盛铃期尤为显著,在三要素吸收比例中对磷要求较双亲高,养分向生殖器官分配较早、再分配能力较强;杂种棉还具有单株叶面积较大、生长速度较快、干物质积累较早、株干重、株铃重和皮棉产量均高于双亲等优势。

The nutrient absorption and photosynthetic dry-matter Production werestudied,using the hybrid cotton and its parents.The results showed:The dy-namics of the nutrient absorption(N,P,K)of plants appeared to be logisticcurves,but the rate of absorption of the three did not coincide with each other.The main stage of nutrient absorption in which about 60% of the total nutrientamount was absorbed was from the beginning of flowering to the full boll period(30/6-28/7);compared with its parents,the net nutrient accumulationamount of Chuanza-4 in different absorption stages was higher,especially fromthe beginning of flowering to the full boll period.And the hybrid cotton neededhigher proportion of phosphorus than its parents.The nutrient distributing toreproductive organs was earlier and the nutrient redistributing potential was greaterthan the other organs.Besides,hybrid cotton got larger leaf area per plant,higher growth rate,earlier dry-matter accumulation,higher dry-matter weight andboll dry-matter Weight per plant than those of its parents.