Lingxiao Zhang1, Stephen Kyei-Boahen1, and Bernie White2. (1) Mississippi State University, PO Box 41, Stoneville, MS 38776, (2) Mississippi State Univeristy, Research Support Unit - Variety Testing Program, Mississippi State Univerity, Mississippi State, MS 39762
Early soybean production system has been adopted in the Mid-South. However, shattering of early matured soybean pod becomes one of the major problems facing Southern soybean farmers. Limited information is available for growers to solve this problem by choosing better varieties. The objectives of this study were to: 1) Determine the critical point of shattering for majority MG IV soybeans; 2) investigate the relationship between shattering and weather conditions; and 3) identify the varieties that are better in resisting shattering. Preliminary data from 2006 has indicated that most pods of early MG IV soybean varieties can hold seeds for the first three weeks after maturity. However, the differences have been seen during the fourth week. In total 56 varieties examined, about 74.3% (or 43 varieties) of them still hold seeds very well (5% or less, 11 varieties) or relatively well (15% or less, 32 varieties). However, about one fourth of the varieties had shattered 20% or greater at the end of the fourth week. Therefore, there were significant differences among different varieties in terms of shattering behaviors. To provide more accurate information about shattering characteristics about each individual variety, more consistent and detailed works are needed for soybean farmers.
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