The effect of different irrigation amounts and different doses of phosphorus-magnesium on the yield characteristics of soybean (glycine max. l.) under the conditions of semi-arid of the Harran Plain

Abstract

This field trial was conducted to examine the effects of different doses of magnesium (Mg) and phosphorus (P) 
fertilizers on yield per decare (da), plant growth and yield characteristics of soybean plants grown with differing 
amounts of water. The experimental design was a randomized complete block with a split-split plot design with 
three replications, and was conducted in 2006 and 2007. Three different water levels (I1, I2, I3), four different 
doses of phosphorus (0, 4, 8 and 12 kg P da-1) and three different doses of magnesium (0, 4 and 8 kg Mg da-1) 
were administered. The cumulative pan values obtained from the class-A evaporation pan were 33% for I1, 67% 
for I2 and 100% for I3. The yield per da, plant height, node number, branch number, first soybean height, 
soybean number, soybean height and number of seeds per soybean were examined. Increasing water, 
magnesium and phosphorus increased the yield per decare, plant height, node number, branch number, first 
pod height, pod number, pod height and seeds per pod. Moreover, increasing water increased the height of the 
first pod, while increasing phosphorus and magnesium reduced first pod height.