Reaction Of Corn Hybrid (Ksc 647) To Uneven Emergence And Non Uniform Stand Reduction
2007
Basafa, M., Khorasan Agricultural and Natural Resources Research Center Nayshabour Agricultural and Natural Resources Research Station | Taherian, M., Khorasan Agricultural and Natural Resources Research Center Nayshabour Agricultural and Natural Resources Research Station
Uneven emergence and uniform or un-uniform stand reduction could decrease maize grain yield. An experiment was carried out in Nyshabour Agricultural Research Station using a mid maturity hybrid Ksc 647(fixed ear), in 1999. A RCBD with 20 treatments representing some of un-uniformity in corn fields, and three replication was used. Yield differences were significant among treatments (p=0.01. Grain yield for early planting date(check) , and two replanting dates (with 11-12 days apart) in full stand (70000 plant/ha), were 9.75 , 10.89 and 8.43 t/ha. Delaying in emergence of 50-75% across row plants by 11 and 22 days , decreased grain yield by average of 3% and 23% and for within row plants 3.3% and 18.3% respectively, comparing to check. Also with un-uniform stand losses of 25% , 50% and 75% of within row plants, grain yield decreased by 14 %, 26.5 % and 46% respectively. Comparison treatments with 2-3 week delaying in emergence of within row plants versus treatment with incomplete stands showed that , while delaying in emergence could decreased grain yield and late emerging plants may have no economical yield , but in no case did the presence of them and their competition could decrease the yield of early adjacent plants. Therefore keeping them could affect and decrease the weeds population. Based on these data, with stand losses of ،ف 25%, replanting the field in less than two weeks after initial planting , would have more benefits comparing to fill-in the original stands. But in case of more delaying , except with stand losses of ،ف 50%, the replanting will not be necessary.
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