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发展杂交早稻(以下称“早杂”),是提高我省早稻产量的一项重大措施。但是,我省早稻生育前期气温低,阴雨多,不利于发挥杂交稻分蘖力强的优势;后期又有梅雨影响抽穗扬花和高温“逼熟”,使籽粒不饱满,结实率低。由于年与年间气温变化较大,也可能会因成熟过迟,影响晚稻栽插。前几年,即使在热量条件优于我省的湖南、江西两省,“早杂”也大多限于长沙、南昌(即
The development of early hybrid rice (hereinafter referred to as “Zaoshi”) is an important measure to increase the output of early rice in our province. However, the early stage of early rice growth in our province is characterized by low temperature and heavy rainy days, which is not conducive to giving full play to the tillering ability of hybrid rice. In the later period, there are also plum rains affecting heading and flowering and high-temperature “ripening”, which make the grain not full and the seed setting rate low. Due to large temperature changes between years and years, may also be due to late maturation, affecting late rice planting. A few years ago, even in the heat conditions are better than our province, Hunan and Jiangxi provinces, “Zaju” are mostly limited to Changsha, Nanchang (ie