KINETICS  OF ADDED POTASSIUMIN WITH NITROGEN 	AND ORGANIC FERTILIZERS DURING POTATO PLANTS GROWTH SEASON

J. Abdulrasol, K.; S. Jawad, K.; Y. Aldolayme, H.

	KINETICS OF ADDED POTASSIUMIN WITH NITROGEN AND ORGANIC FERTILIZERS DURING POTATO PLANTS GROWTH SEASON
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 2014, Issue 2, 2009, Pages 0-0
Authors
K. J. Abdulrasol; K. S. Jawad; H. Y. Aldolayme
Abstract
Laboratory experiment was conducted according to kinetics criteria on samples of field experiment on silt loam soil(Alluvium) to investigate the efficiency of kinetics criteria in predication of plants response to potash fertilization by utilization potato plants as biological indicator . The study was conducted by soil extraction with 0.0005N citric acid successive extraction for ten times. The period of each extraction was twelve hour and the ratio of extraction was 1:10 according to batch successive equilibrium technique at three periods of plant growth. Five kinetic models were used to describe potassium release. These models include, zero order, first order ,diffusion, Elovich, and power function. The results indicated that Power function was the best equation to describe potassium status and its rate coefficient . The rate coefficient of potassium release was 0.413 mg. kg-1 .h-1 in the soil before planting & was the asame after harvesting in the control treatment. This value was counting high & above the critical limits which defined by technicians. The high value of potassium release at flowering stage indicated that the soil had good ability to supply the plant with potassium during this stage which have high potassium uptake. Organic fertilizer increased rate coefficient of potassium release significantly while potassium fertilizer decreased it significantly. As nitrogen fertilizer had no effect.

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