Abstract

This study was conducted to determine the effects of inoculation, planting dates and imbibition duration on the seed yield and agronomic traits of soybean (cv. P-9292) under Bafra (Samsun) climatical condition. Four planting dates (6, 17, 27 May and 6 June) were assessed in 1993. For imbibition, the seeds were soaked in wet towels for 0, 3, 6, 12, 24 or 48 hours. Then, either inoculated (With R. japonicum) or non inoculated seeds were planted. A split-split randomized block design with three replicates was used. Emergence, flowering, pod filling and the maturity prolonged when the seeds were early planted. But at the last two planting dates (27 May and 6 June), when the seeds were soaked for 24 and 48 hours, the emergences hastened for 2 to 3 days. The growing period of plants ranged from 124 to 113 days depending on the planting dates. The plant height, number of pod/plant, number of seed/plant, number of nodule/plant, nodule dry weight/plant and 1000 seeds weight were increased with the inoculation. However, in the last planting date, all the values for the same characters were decreased. The oil content of seed was decreased, but the protein content was increased by inoculation. The oil and protein contents of seed were 23.04 and 36.96 %, respectively, when the seeds were not inoculated. Similarly, 22.86 and 38.33 % values for oil and protein contents, respectively, were obtained when the seeds were inoculated. The effect of inoculation on the protein content was highly significant (P

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