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上岗镇是稻、麦轮作产粮区,每年种植水稻面积3,333多hm~2,其中杂交水稻种植3,066hm~2,占水稻总面积的90％以上。可是近几年来,杂交稻产量出现下降现象。通过调查,现将产量下降的原因及期预防措施浅析如下,供参考。 1 产量不高因素 1.1 田间杂株多。通过实地调查,杂交稻田的杂株有不育系、保持系、恢复系、不育株、变异株、大青棵等类型。一般杂株率在2～5％,多的达
The town is rice, wheat rotation for grain-producing areas, each year more than 3,333 hm 2 of rice planted area, including hybrid rice planting 3,066 hm 2, accounting for more than 90% of the total rice area. However, the yield of hybrid rice has dropped in recent years. Through the investigation, now the reason for the decline in production and preventive measures are as follows for reference. 1 is not high yield factors 1.1 more than miscellaneous plants in the field. Through on-the-spot investigation, hybrid rice hybrids have sterile lines, maintainer lines, restorer lines, sterile lines, mutant lines and Daqing trees. General rate of 2 to 5% of the hybrid plant, the more up to