施氮量和種植密度對(duì)紅花大金元煙田小氣候和產(chǎn)值的影響
The Effect of Nitrogen Application and Planting Densities on Microclimate of Field and Output Value of Hongda
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摘要: 在大田條件下研究了施氮量和種植密度對(duì)紅大的農(nóng)藝性狀和產(chǎn)值效益的影響,，并測(cè)定了不同群體煙田光照強(qiáng)度和田間溫度的差異,。結(jié)果表明：前期葉面積系數(shù)主要受施氮量的影響，隨著生育期的推移,，密度作用加強(qiáng),。團(tuán)棵期隨著施氮量和種植密度的增加，煙株基部的光照強(qiáng)度減弱,，在平頂期施氮量和密度互作對(duì)煙株下部,、中部的光照影響差異明顯。一天中煙田不同垂直高度溫度隨施氮量的增加變化趨于緩和,，施氮量越小,，溫度變化越劇烈。旺長(zhǎng)期14點(diǎn),，煙田的最高溫度出現(xiàn)在離地面垂直高度為65 cm的冠層,，其它時(shí)刻隨垂直高度的增加而增加。低氮量水平下,，增加種植密度可獲得較高的產(chǎn)值；高氮水平下,，增加種植密度并不能增加產(chǎn)值效益,，且使煙葉的質(zhì)量下降,。綜合比較，每666.7 m2施5 kg氮,，種植1 330株產(chǎn)值效益最好,。Abstract: In this article, the effect of nitrogen application and planting densities on agronomic character and output of Hongda in the field is researched, and we also measured the difference of light intensity and temperature during different groups. The results showed that leaf area index is preliminary mainly affected by the amount of nitrogen with the advance of growth period, planting density became more important. In Rosette period, light intensity of the base weakened with the increase of nitrogen application and planting densities. But the interaction of nitrogen application and planting densities in Flattened period on the lower, middle parts are clear differences. Temperature changes in different vertical height with the increase of nitrogen, smaller nitrogen application, more drastic temperature changed. In Vigorous period, at 14, the highest temperature in tobacco fields appeared the canopy which was 65 cm height from the ground, other times increased with a vertical height increased At low nitrogen level, increasing planting density could get a higher output, and at high nitrogen level, increasing planting density did not increase the output, but declined in the quality of tobacco. Comprehensively, 5 kg nitrogen and 1,330 strains per 666.7 m2 can reap a best productivity.
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