Abstract

A factorial experimental was conducted in R.C.B.D. designe with three replications in the spring and autumn seasons of 2002. Four corn genotypes (Bohoth 106, Ipa 3001, Ipa 3003 and 5012) were assigned in the main plots and four applications timing of potassium fertilizer in the sub _ plots (all potassium was applied after emergence and three other treatments include the split of potassium fertilizer for five, four and three parts (after 2, 3 and 4 weeks after emergence) respectively, to study the effect of splitting potassium fertilizer in yield and its components of four corn genotypes .Significant effects were found from splitting potassium to five and four parts in spring season only which resulted in an increase in plant yield about 16% and 13% respectiviely when compared with treatment that applied all potassium after emergence and that increased harvest index from 0.32% to 0.36% and 0.38 % respectively. This result was found because the increase that found in the weight of grain, but in autumn the control was more in yield . We suggest to split potassium fertilizer to five or four parts in spring season and apply all of it in autumn season.

The article was added to IASJ on 2015-04-27

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