Study On Growth Dates Characters And Photo-thermal Models Of Soybean Varieties In China

Soybean has many uses, it plays a very important role in the national economy. Soybean, being short條ight crop, which liking temperature and water, responses sensitively to photo梡eriod. The difference of soybean varieties maturity dates, in essence, is different response of soybean physiological characters to light and temperature. Because the region fitting the growth of soybean is very limited, the ecological characteristics of different varieties, especially the growth dates, is very important in introducing, breeding and planning varieties. On the basis of the ecological experiment data of soybean varieties in china from 1980 to 1982, which were very abundant and comprehensive, this paper analyzed the characters of developmental stages of four groups of soybean varieties, which were sowed in seven ecological regions (including 34 experimental plots), utilizing the ration between the DFM and DEF (R/V),the developmental stages characters standard deviations, the relative corresponding photo梥ensitivity coefficient (RPSC), the relative corresponding thermal梥ensitivity coefficient(RTSC), mainly analyzed the characters of development stages and photo梩hermal response of soybean varieties in the North China. Then using the analysis method of the quadratic regression orthogonal rotation design to select data that had already gotten from past experiment, we preliminary created soybean photo梩hermal models and got satisfied results. This paper made a systematic studying, exploring and utilizing, to the results of soybean ecological experiment in China. It will provide significant basis and reference for the regionalization of soybean producing, the introducing varieties, the breeding of soybean varieties and the soybean scientific study in China. ?? The main conclusions of this paper were: 1. The results showed that there were significant differences in the responsive trend of growth period characters among four groups of soybean varieties, which were resulted from the different planting place and sowing dates. With the varying of planting places from the North to the South in China, the days from sowing to emergence, emergence to flowering (DEF), flowering to maturing (DFM) and the days from planting to maturing (DPM) were reduced in soybean varieties of the eco梤egion in the North of china (N). The RTGPT of soybean varieties originated from the eco梤egion of the south part land part II of the China (Sd, SCII), and the Yellow桯uai桯ai (HH) had different degree of the fluctuation , these show that the photo梩hermal complexity and the varieties varied in china. With delaying in planting types梥pring, summer and autumn, generally the dates of developmental stags reduced in all varieties .The days sequence of the developmental stages in the same growth period were, SCJI > SCI > HH > N, except the days from flowering to maturity. 2. The relations of the days between the DPM and the developmental stages were, that the DPM of N was mainly influenced by the DFM; HH was mainly influenced by the DEF in spring and by the DFM in summer, but was mainly influenced by the DFM in Autumn; SCII was mainly influenced by the DFM in spring and autumn, but was mainly influenced by the DEF in summer . The generally varying trend of the ration between the DFM and DEF (R/V), in different sowing seasons was, autumn>summer>spring, and in different groups was, N>HH> SCI>SCII. 3. The genera...