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杂交水稻对光、温、水等气象条件的要求,与常规品种有很大的不同。例如高温强光是发挥杂交优势的重要条件,但抽穗前后它既怕低温又怕高温,如果温度条件不良,则会增加空壳,降低结实率。造成空壳率高的主要原因,是现有恢复系的恢复力还不够强。因此,研究杂交水稻安全齐穗期的农业气象指标,分析适宜播插期的农业气候条件,以及开展相应的情报、预报服务工作,是杂交水稻栽培中的重要课题。 一、生育期与光、温特性 在南方稻区,为了夺取双季丰收,水稻品种的熟期,是一个重要的经济性状。籼型杂交水稻南优2号、3号、6号是我省目前种植面积大,产量高的组合,可以作中稻,也可以作晚稻,其熟期主要是受亲本热期和杂交种光温特性的影响,生育期较长。中稻
Hybrid rice on light, temperature, water and other weather conditions, and conventional varieties are very different. For example, high temperature and high light is an important condition to play a hybrid advantage, but before and after heading it is afraid of low temperature and fear of high temperature, if the temperature conditions are poor, it will increase the shell, reducing the seed setting rate. The main reason for the high shell percentage is that the resilience of the existing restoration system is not strong enough. Therefore, it is an important issue in the hybrid rice cultivation to study the agricultural meteorological index of hybrid rice at heading stage, analyze agro-climatic conditions suitable for sowing date, and carry out corresponding information and forecast service. First, the growth period and light and temperature characteristics In the southern rice area, in order to seize double-season harvest, the maturity of rice varieties, is an important economic traits. Nanyou No.2, No.3 and No.6 of indica hybrid rice is a combination of large planting area and high yield in our province, which can be used as middle rice or late rice. Its maturity period is mainly affected by the parental heat and hybrid light and temperature The impact of characteristics, longer growth period. Medium rice