荆州市中稻产量与气象条件的关系

采用正交多项式法分析了荆州市历年中稻稻穗分化期和抽穗结实期的气象条件(温度、降水、日照时间 )与中稻产量的关系。结果表明 ,荆州市中稻产量与稻穗分化期的平均气温呈极显著负相关 ,与同期日照时数呈极显著正相关 ,与同期降水量相关不显著 ;与抽穗结实期的平均气温呈极显著负相关 。

Effects of Nitrogen Level and High Temperature Stress on Yield, SPAD Value and Soluble Sugar Content of Early Rice Ganxin 203

This study aimed to investigate the combined effects of nitrogen level （high and ordinary） and high temperature stress （37 ℃, 4 d） at the late panicle ini- tiation stage on yield, SPAD value and soluble sugar content of Ganxin 203, an early rice cultivar. The results showed that under both high and ordinary nitrogen levels, high temperature stress reduced the seed-setting rate, yield per stem, SPAD value and soluble sugar content of Ganxin 203; under both high and ordinary tem- peratures, high nitrogen level increased the seed-setting rate, yield per stem and soluble sugar content of Ganxin 203; the seed-setting rate, yield per stem and yield per plant of Ganxin 203 under high temperature and high nitrogen level were higher than those under high temperature and ordinary nitrogen level. It suggests that ap- propriate high nitrogen level contributes to weakening the negative effects of high temperature stress on rice yield.

株溪村早稻超晚稻高产经验(连载七) 加强中后期培管 确保晚稻丰收

晚稻的中后期包括稻穗分化形成期、孕穗期、抽穗开花期、灌浆期、成熟期等五个时期,是决定其产量的关键时期。株溪村通过多年的生产实践,总结出了一套成功的晚稻中后期管理经验,其具体作法是: 1.科学管水 晚稻中后期生长对水分十分敏感,若管水不当,将造成大幅度减产。株溪村在晚稻中期采取浅水促分化、寸水保胎的管水方法,后期则干干湿湿、以湿为主的管水方法,到完熟期则保持浅水灌溉,充分发挥杂交稻第2次灌浆的优势,防止青枯逼熟。 2.看苗施肥 株溪村在晚稻中后期的施肥上。