Effect of biofertilizers and harvesting dates on growth, yield and keeping quality of Some sweet potato cultivars under Sandy soil conditions

This work was carried out during the two successive summer seasons of 2003 and 2004 at El-Khattara Experimental Farm, Faculty of Agriculture, Zagazig University to study the effect of cultivars and harvesting dates and mineral and biofertilizers on growth, plant chemical composition, yield and its components and storage roots quality as well as storability of sweet potato plants under sandy soil conditions using drip irrigation system .