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为研究旱地条件下氮肥对糜子灌浆期农田小气候、植株光合特性及产量的影响,以榆糜2号为试验材料,在陕西榆林小杂粮示范基地设置4个氮肥处理,分析糜子灌浆期农田小气侯指标、光合生理指标及产量构成要素。试验结果表明,与不施肥对照相比,氮肥处理显著降低糜子株间光照度和株间气温,减少漏光损失的同时又增加株间相对湿度;整个籽粒灌浆期,随着氮肥水平的提高,糜子不同节位叶片的叶绿素相对含量(SPAD)和净光合速率(Pn)均呈增加趋势。其中,以N4处理(纯氮195kg/hm2)对糜子籽粒灌浆期农田小气候特性及光合特性的影响最大。N3处理(纯氮150kg/hm2)的糜子产量可达到4 605.8kg/hm2,比对照增加了44.7%,是该地区糜子生产适宜的施氮量。
In order to study the effects of nitrogen fertilizer on the microclimate, photosynthetic characteristics and yield of farmland in the stage of millet filling, the experiment was conducted with Yuyou 2 as test material, four nitrogenous fertilizer treatments were set up in Yulin Minority Grain Demonstration Base in Shaanxi Province, Indicators, photosynthetic physiological indicators and yield components. The results showed that compared with the non-fertilization control, nitrogen application significantly reduced the light intensity and inter-plant temperature, decreased the light leakage loss and increased the inter-plant relative humidity. During the grain filling stage, with the increase of nitrogen fertilizer level, The leaf chlorophyll content (SPAD) and net photosynthetic rate (Pn) of node leaves showed an increasing trend. Among them, N4 treatment (pure nitrogen 195kg / hm2) had the greatest effect on the microclimate characteristics and photosynthetic characteristics of farmland during the grain filling stage of millet. The yield of Millet with N3 treatment (pure nitrogen 150kg / hm2) could reach 4 605.8kg / hm2, an increase of 44.7% compared with the control, which is the suitable nitrogen application rate for the production of millet.