-

Effects of 7 irrigation treatments consisting of 6, 7, 8 and 12 irrigations , two levels of nitrogen fertilizer ( n0= 0 and n1= 100 kg N/ha ) and two levels of
phosphorus ( P0=0 and P1= 100 kg P205 / ha ) were studied on variety Clark 63 of
soybean. A split-split plot design with three replications was used . Amount of water used in the field was measured using two Parshall Flumes , and the following anvunts
2
were calculated ( liters in 30 m ) :
= 137154 , W2= 105281, = 151089 , = 214869
= 193599 , W6= 147791 and = 424625
Results obtained in this experiment are summarized as follows : 1) Most traits under study such as number of nodules, root lenght , number of seeds per pod, yield, oil percentage, amount of oil per plot and amount of protein per plot were increased as a result of increasing amount of water . 2) Increased amount of water reduced protein percentage . 3) Nitrogen increased plant height and protein percentage
however, it has decreased number of nodules and oil percentage . 4) Phosphorus
caused a reduction in number of seeds per pod and in oil percentage