砂田油葵适宜密度研究

Research on suitable density of oil sunflower in gravel-sand mulched field

在砂田条件下研究不同种植密度对油葵生长发育规律、光合特性及产量的影响.结果表明:在500、1 500株/667m2时油葵株高最高;在1 500株/667m2时叶面积指数达到最大,净光合速率也高于其他密度,但蒸腾速率显著低于其他密度;从产量的表现上看,1 500、2 000株/667m2时产量较高,显著高于500、750、1 000株/667m2,并且1 500株/667m2的水分利用率最高,说明作物产量与水分利用率有显著的正相关性.回归分析表明,砂田油葵产量最高的种植密度是1 631株/667m2.因此,初步认为在宁夏中部干旱带砂田种植油葵适宜的密度以1 500～1 631株/667m2为宜.

This experiment through research contrast gravel-sand mulched field condition under oil sunflower different planting density processing growth developmental mechanism, photosynthesis characteristic and yield and so on. The result indicated： In 500 plants/667 m2 and 1 500 plants/667 m2 time oil sunflower high highest, but when 1 500 plants/667m2 leaf area index achieves in a big way, photosynthesizes radio also to be higher than other densities only, but the transpiration rate obviously is lower than other densities; Looked from the output performance that 1 500 plants/667 m2 and 2 000 plants/ 667 m2 are high, obviously is higher than 500 plants/667 m2 ,750 plants/667 m2, 1 000 plants/667 m2 , and 1 500 plants/667 m2 moisture content use factors are highest, explained that the crops the output and the moisture content use factor have the remarkable relevance. Regression analysis showed that the highest yield of oil sunflower, gravel-sand mulched field planting density is 1 631 plants /667 m2. Therefore, obtains initially middle Ningxia under the arid zone certain sludge fertilizer condition, the gravel-sand mulched field planter oil sunflower is suitable density take 1 500--1 631 plants/667 m2 as suitable.