关键词: 夏播谷子, 渗水地膜, 穴播, 增产机制

Abstract: In order to study the influencing mechanism of water-permeability plastic film mulching and bunch planting cultivation on the yield of summer millet, this paper measured the yield components, dry matter accumulation, physiological indicators heading agronomic traits and photosynthetic performance features and analyzed their effect on millet yield. The results showed that: under no water in the whole growth period with 356 mm of rainfall, the millet yield using water-permeability plastic film mulching and bunch planting cultivation in open field increased 48.57% compared with the control drilling. The dry matter accumulations of each organ growth stages of the treatment using water-permeability plastic film mulching and bunch planting cultivation werehigher than the control. For the treatment,the millet plant nutrition and reproductive growth was vigorous, plant height was slightly higher than the control, stem stouter, ears larger; heading net photosynthetic rate, leaf area and leaf area index were higher than the control leaves, indicating that in heading stage, key period for yield formation, leaf areas of individuals and groups critical were more bigger, photosynthetical active areaincreased, photosynthetic capacity strongthened, which was conducived for the synthesis of organic substances and it was key for yield increasing; under the same number and valley acres considerable rate of the population, the single spike weight and grain weight significantly increased, so the yield of treatment was increased greatly.The water use efficiency and nitrogen partial factor productivity increased by more than 45% using water-permeability plastic film mulching and bunch planting cultivation. Water-permeability plastic filmcould hold water and fertilizer, inhibit weed growth, while bunch planting could not ensure the emergence of groups of top soil, but also reduce the waste of water and fertilizer for unnecessary seedlings, so water-permeability plastic film mulching and bunch planting cultivation could greatly improve the efficiency of water and fertilizer, and then increase the yield of foxtail millet.

Key words: summer foxtail millet, water-permeability plastic film mulching, bunch planting cultivation, yield increasing mechnism