Soybean Planting Regionization Of Inner Mongolia Based On The Varietal Maturity Group Classification

To classify soybean varieties from Inner Mongolia Autonomous Region of China into differentmaturity groups,21standard soybean varieties which represent MG000, MG00, MG0MG Ⅰ MG Ⅱand MG Ⅲ were introduced from noteh America as references in this study. In the field tests,120localvarieties collected from the major soybean producing areas of Inner Mongolia Autonomous Regionwere planted in Zhalantun, Chifeng, Hohhot and Hangjin Rear Banner together with the mg referencevarieties. The days to VE (emergence), R1(beginning bloom), R7(beginning maturity) and R8(fullmaturity) were recorded. Two methods of "classifying by the annual result" and "classifying by meanresults of many years" were used for maturity group classification of the soybeans. Results showed thatInner Mongolia Autonomous Region varieties were classified into MG0000, MG000, MG00, MG0,MG Ⅰ,MG Ⅱand MG Ⅲ. Correlation analysis showed that, for each group soybean varieties collectedfrom Inner Mongolia Autonomous Region, total growth duration (TGD) had very significant positivecorrelation with both vegetative growth period (VP) and reproductive growth period (RP), but it wasnegatively correlated with R/V. There was a negative correlation between VP and RP of MG Ⅰ, MG Ⅱand MG Ⅲ soybean varieties. However, VP of MG0000-MG0soybean varieties showed a positivecorrelation with RP. However, among the varieties belongig to MG I to MG III, the correlation wasnegateve.According to the MG classification of the test varieties and their planting area and referring to theagricultural regionalization and meteorological data, soybean planting regionization of Inner MongoliaAutonomous Region based on the varietial MG classification was suggested, and Inner MongoliaAutonomous Region soybean MGs geographical distribution map was drafted. Affected by thetopography and elevation, the distribution boundaries of the soybean maturity groups were roughlyparallel with contour and isotherm, showing the trend of gradually extended gradient distribution fromnorthwest to southeast and also from north to south.The performance of different varieties in growth period traits in different locations, different yearsshowed that the MG identifying scope of each test location was limited and the results in different yearswere also different. Therefore,"classifying by mean results of many years" was suggested be used forsoybean MG classification based on many years trails in the typical location. Suitable identify locationsfor soybean MGs in Inner Mongolia Autonomous Region were suggested as Dayangshu in ElunchunAutonomous Banner for MG0000and MG000, Zhalantun for MG00, MG0, Ulan for MG Ⅰ, Chifengfor MG Ⅱ and Hohhot for MG Ⅲ.In order to better cover different MG varieties, proposal of setting Very-early Group in SoybeanUniform Trials of Inner Mongolia was put forward for MG0000varieties selection which could beplanted in Hulunbeier cold region in Spring or in Western Region after the wheat cropping. MG Ⅱwasalso be suggested increasing in Soybean Uniform Trials of Inner Mongolia for avoiding comparing theyield of MG Ⅱvarieties with the MG Ⅲ group control (Jilin30) in Middle Group of the Inner Mongolia Spring Planting Soybean Region trails.