The effect of nitrogen, potassium and salinity Levels on some morphological and physiological traits of corn (S.C.704)

Subject Areas : crop production

Received: 2011-07-20 Accepted : 2011-09-16 Published : 2012-01-08

Keywords: corn, nitrogen, potassium, salinity,

Abstract :

To study the effects of salinity on morphological and physiological characteristics, an experiment was performed in Factorial completely randomized design with four replications in greenhouse condition in 1388. Factor A included two levels of salinity a1) The salinity of irrigation water as control a2) The salinity of 6 dS/m , factor B include three levels b1)the rate of nitrogen based on soil test, b2) the rate of nitrogen is 50% more than soil test b3) the rate of nitrogen is 100% more than soil test, and factor C also included in three, levels C1) the rate of potassium based on soil test C2) the rate of potassium is 50% more than soil test, and C3) the rate of potassium is 100% more than soil test. During the growth morphological characteristics were studied: diameter of stem height of shrub in two time stages, number of leaves in harvest time, the greenish rate in two times, leaf surface, relative water content and membrane stability indicator. The result showed that the exertion of salinity causesd the decrease of stem diameter, height of shrub, Leaf area, and relative water content. However the greenish rate and membrane stability indicator were increased but this didn’t have any meaningful effect on the number of leaves .With nitrogen usage increase at sline condition there was a meaningful increase in shrub height greenish rate, leaf surface, relative water content and membrane stability indicator. Also it was shown that with application of 50% of nitrogen the greatest leaf surface increases to 0/178m2 was attained.The use of potassium with and without salinity condition caused some changes. In salinity condition the height was increased with the usage of 100% potassium (50%) there was no significant difference.

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