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EFFECT OF SPLITTING OF SOME SOURCES AND LEVELS OF POTASSIUM ON CONCENTRATIONS OF N،P AND K IN MAIZE GRAINS. | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 39, Issue 6, 2008, Pages 1-10 | ||
| Authors | ||
| Hameed K. Al-Salmani; Abbas A. Al-Amery | ||
| Abstract | ||
| Field experiment was conducted at private farm in Abu-Ghraib during autumn season of 2003, to study effect of three potassium sources(Potassium, Cloride، Potassium sulfate and potassium nitrate) with in three levels (80,120 and 160) Kg K.ha-1 ,applied in three times, First, All quantity was added at sawing time .The second،1/2 quantity was added at sowing time. And the other 1/2 was added at the end of elongation stage. In the third، 1/3 was added at sawing time، the other 1/3 added at the end of elongation stage, and the last 1/3 was added at tasseling on concentrations of N, P and K in grain. Randomized complete block design was used with three replications.320 Kg N.ha-1 of urea and 100Kg p.ha-1 of super phosphate were added to all treatments. At maturity plants were harvested.Concentrations of N, P and K were determined. The results showed that all potassium sources,levels and time of application significantly increased concentrations of N, P and K in grain(1.6%,0.7% and 0.6%). High increment was obtained when 160 Kg k.ha-1 of potassium nitrate added at three times.The concentrations of N,P and K were (1.8%,0.8% and 0.80%),respectively. | ||
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