Grain N, P, K Concentrations in Wheat as Affected By Potassium and Zinc Sulfate Fertilization to Cope with Drought Conditions
2016
KEIKHA MAHDI | KEIKHA GOLAMALI
This study has been performed to determine Grain N, P, K concentrations in wheat as affected by potassium and zincsulfate fertilization to cope with drought conditions in Zahak agricultural research station, at weather condition ofSistan’s area. Experimental design was for two years (2005-2007) with three replications. The water stress included:three irrigation treatments (I1, I2 and I3 are irrigation after 50, 70 and 90% soil water depletion (SWD), respectively),three level of potassium sulfate intake fertilizer (K0, K1 and K2 are Control, 150 and 250 Kg/ha, respectively) andthree level of zinc sulfate intake (Z0, Z1 and Z2 are Control, 50 and 80 Kg/ha, respectively). The results showed thatthe grain N concentrations are not affected by water stress, but, decreased with an increase in potassium consumption.Also, zinc consumption increased the grain N concentration. Increasing zinc consumption caused an increase in Nconsumption in case of moisture availability (irrigation after 50% soil water depletion). Moreover, the grainphosphorus concentration declined with an increase in zinc consumption, but enhanced by potassium increase of thesoil around the roots and hard stress conditions (irrigation after 50% soil water depletion). In this study, continued soilavailable water depletion up to 90% soil water depletion associated with increased potassium consumption resulted inimproved potassium concentration of the grain.
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