不同氮素水平对北疆高产杂交棉功能叶生理特性及产量的影响

摘要

[ Objective ] According to cIimatic conditions and characteristics in Northern Xinjiang, the study on the effects of different amount of nitrogen fertiIizer on hybrid cottons Ieaf photosynthetic characteristics and yieId was conducted to expIore the strategies of using fertiIizer so as to provide theoreticaI basis for cuItivation in northern Xinjiang. [ Method ] One hybrid cotton cuItivar Biaoza Al was seIected as the experimentaI materiaI and photosynthetic rate chIorophyII vaIue mean foIiage incIination angIe Ieaf area index were measured at different nitrogen stages. [Result] With the amount of nitrogen increased the number of hybrid cotton boII per pIant and boII weight showed a decreasing trend after the first increase. In the experimentaI conditions amount of nitrogen in the 374. 7 -375. 6 kg/hm 2 the hybrid cotton yieId reached maximum. InadeGuate or excessive nitrogen on Ieaf photosynthetic rate chIorophyII vaIue mean foIiageincIination angIe and Ieaf area index cIusters were affected in different degrees, thus affecting the production and transfer of dry matter, and affecting the finaI yieId. [ conclusionl In order to maintain a high photosynthetic rate, reasonabIe foIiage angIe and Ieaf area index, and high yieIds, the key is appropriate amount of nitrogen.