The effect of distances and periods of Agriculture irrigation in the growth and development of shrub Jatropha planted in the province of Muthanna

1-The effect of the distances between the Jatropha bushes in the field: the experiment carried out in the Province of Muthanna, where planted on the dimensions of (2meters),and between the planted (1,2 and 3 meters), designed by completed random sectors and three replicates. At the end of the experiment the (2 meters) treatment was significantly exceeded in the most of the traits( the number and the length of the branches, number of leaves, the leaf area of the plant, and chlorophyll content leaves ). 2-The experiment of Irrigation period: that is appropriate during the growing season of the tree. On the basis of the difference in the number of irrigations events (6, 12, and 18 days) in accordance to the designed completed random sectors, and three replications were tested during the year of 2015. Fertilizer applied was 150 kg/ha urea, 100 kg/ha of P2O5 , and 100 kg/ha of K2O. End examined the following attributes (the number of branches of the plant, number of leaves , the leaf area of the plant, chlorophyll content in leaves), the 12 day irrigation interval showed the best performance in terms of tested characteristics.