关键词: 降解, 降解

Abstract:

Research and development resowing maize production was to increase maize production and income effective way in Shanxi middle area. Less suitable varieties and the low cultivation yield were the main problems in the production. This research took the especially early variety ‘Bingdan4’, ‘Tezao 1’, ‘Jizaodan 2’ and the early variety ‘Zhengdan 958’ as supplied material. By multi-factors test and analysis of 4 densities and 3 planting periods. The results showed that: in the different material, the yield of ‘Bingdan 4’ was the highest, as being 6308 kg/hm2. The second yield was the especially ‘Tezao 1’, as being 6255 kg/hm2. Compared with ‘Jizaodan 2’, the both were highly significant increase. But ‘Zhengdan958’ did not mature normally. In the different densities it was the highest yield with 75000 plants/hm2, as bing 6231 kg/hm2, and with 67500 plants/hm2 its yield decreased significantly. As lower and lower density the yield was significantly decrease. Sowing in June 25th the yield was 6723 kg/hm2, but in June 30th and July 5th, as delayed sowing it was significantly decrease. So later sowing in the late growth of maize, under the low temperature and the early frost, resulting in bald increased grain number and grain weight decreased, the yield was to decrease. The interaction of three factors were: selected ‘Bingdan 4’ and ‘Tezao 1’, using 75000 plants/hm2 density, and planting on June 25th, the yield was the highest to 8003 kg/hm2 and 7770 kg/hm2.