目前在我国生产上应用的籼型杂交水稻生育期都比较长,一般都作中稻和晚稻栽培。进一步扩大杂交稻的种植面积受到了季节的限制。近两三年,各地配制一些生育期短的早杂优组合,进行了区域试验和示范种植,局部地区已在生产上推广应用,取得了可喜的成绩,从生产实践的需要来看,早杂优组合必须兼备几个特性:即生育期适宜,丰产、抗病、能耐不良气候因子。与常规早稻相比,要有比较突出的竞争优势。一、适应早季栽培的生育期。我省除了闽南一部分地区早季可以种植四优二号等生育期较长的杂优组合外,其余 At present, the indica hybrid rice used in the production of our country has a longer growth period and generally is used for medium and late rice cultivation. Further expansion of hybrid rice acreage season has been limited. In the past two or three years, some early hybrids with short growing period have been formulated, regional experiments and demonstration planting have been carried out, some areas have been popularized and applied in production, and gratifying achievements have been made. According to the needs of production practice, Excellent combination must combine several characteristics: the appropriate growth period, high yield, disease resistance, tolerance of adverse climatic factors. Compared with the conventional early rice, there should be more prominent competitive advantage. First, to adapt to the growing season of early cultivation. In addition to the province in southern Fujian in some parts of the early season you can plant Siyou No. 2 and other longer-growing hybrid combinations, the rest