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早晚连作稻必须确保“两个”安全,即确保早稻安全穗分化和晚稻安全齐穗,才能保收;必须保证两个“足够”,即保证早稻和晚稻两者都要有其够的本田营养生长期,才能高产。在南北气候交错地区的热量条件下,两个“安全”和两个“足够”之间有着尖锐矛盾。根据我们1972—1978年试验结果,在南北交错的汉中盆地(陕西省南部),有着适应于当地热量条件的早、晚稻品种类型,可以克服“安全”与“足够”的矛盾。早稻品种按营养生长和生殖生长的关系,可金为“前短后长型”、“前后平衡型”和“前长后短型”三种类型。晚稻按抗冷能力可分为“强抗冷型”和“弱抗冷型”。不同的晚稻品种因生育期不同,满足它正常生长需要的所谓足够的本田营养生长期长短也不一样。这些不同品种类型,对当地的热量条件有不同的适应性。通过几年来的实践,我们认为,在南北交错地区的气候条件下,只要选用适应型的品种,并采用与之相适应的培育长令壮秧技术,取得两季高产是有可能的。上述观点对于黄河流域麦茬稻也有一定意义。
Sooner or later, rice must be kept “two” safe, that is, to ensure ear differentiation of early rice and full security of late rice in order to be insured; two “sufficient” must be guaranteed to ensure that both early and late rice have adequate Honda nutrition Growth period, to high yield. There is a sharp contradiction between the two “security” and the two “sufficient” conditions in the heat conditions in the climate where the north-south climates. According to our results from 1972 to 1978, the Hanzhong Basin (southern part of Shaanxi Province), which is intertwined in the north and south, has early and late rice varieties adapted to local caloric conditions and can overcome the contradiction between “safe” and “adequate”. Early rice varieties according to the relationship between vegetative and reproductive growth, gold for the “short before and after the long,” “before and after the balance type” and “before the long after the short” three types. Late rice by cold resistance can be divided into “strong cold type” and “weak cold type.” Different late rice varieties due to different growth stages to meet its normal growth needs so-called enough Honda vegetative growth period is not the same. These different types of species, the local conditions of the heat have different adaptations. After several years of practice, we believe that it is possible to achieve high yield in two seasons by adopting adaptive varieties and adapting cultivation techniques to cultivate them under climatic conditions in the north-south interlaced areas. The above point of view for the Yellow River Valley also has some significance of stubble rice.