作物生长中光照和氮肥施用量的相互关系研究

INTERRELATIONSHIP OF LIGHT AND NITROGEN FERTILIZER APPLICATION IN CROP GROWTH

应用盆栽试验，在人工气候箱内进行的研究结果表明：光照强度（Ｘ１，μｍｏｌ／ｍ２·ｓ）和氮肥施用量（Ｘ２，ｇ／ｐｏｔ）均对莴笋生长及生物量产生影响，且二者的变化与莴笋生物量的关系可表示为ｙ＝－０．３７５＋０．０２３０Ｘ１＋９．４２ｌＸ２＋０．０２５ｌＸ１Ｘ２－０．１３１×１０－４Ｘ１２－１７．７９４Ｘ２２形式；不同光照强度下氮肥施用量与莴笋生物量的关系均可表示为ｙ＝ｂ０＋ｂ１Ｘ＋ｂ２Ｘ２形式；不同氮肥施用量下，光照强度与莴笋生物量的关系亦可用二次或三次多项式来表示。根据研究结果，还求得了氮肥施用量（Ｘ２）与光照强度（Ｘ１）的关系为：Ｘ２＝０．４４６－０．４７７×１０－２Ｘ１＋０．２６９ ×１０－４Ｘ１２－０．３９４×１０－７Ｘ１３。此外，本研究还探讨了光照强度、氮肥施用量与莴笋的氮素营养状况的关系。

By using the method of pot culture experiment in the case of artificial climate, the result indicated that the effects of light intensity (X1) and N application (X2) on lettuce yield (y) were mathematically represented by the following equation in this study:y = -0.375 + 0.0230X1+9.42lX2+0.0251X1X2-0.131 × 10-4X12-17.794X22;The efficiency of N fertilizer was influenced by light intensity. A quadratic multinomial equation y = b0 + b1X+b2X2, could be used to describe the correlation between N application and lettuce yield. Also, quadratic or cubic multinomial equation could be used to describe the correlation between light and lettuce yield. Accordingly, the effects of light intensity (X1) on N application (X2) were mathematically represented by the following equation:X = 0.446 - 0.477 × 10-2X1 + 0.269×10－４X12-0.394 ×10-7X13. Moreover, nitrogen nutrition of lettuce was bigger influenced by light and N application.