A field experiment was carried out in order to determine the proper irrigation rate and the best organic matter in a loamy sand soil to optimize the growth, biomass, and chemical composition of the seedlings of Jatropha curcas (poison nut) and Moringa oleifera (horseradish tree). Three irrigation deficits (100, 75, and 50% of field capacity F.C.) and three organic substance treatments [control, compost, and humic acid (HA)] were implemented in a splitplot design. Generally, increasing the irrigation deficit from 100% to 50% of F.C. decreased growth and biomasses for both plants. The 75% F.C. was the better treatment that enhanced the growth and biomasses parameters of J. curcas seedlings. Contrarily, HA exceeds compost in increasing these growth parameters but compost and HA were alike for increasing shoots (fresh and dry weights) and decreasing roots biomasses. HA and compost under 100 and 75% F.C. were significantly similar to the decreased roots biomass, as well as, the S:R ratio of J. curcas seedlings. The results revealed that regardless of their effects and mechanism to resist drought, both J. curcas and M. oleifera are well adapted to semi-arid regions when amended with HA or compost, under irrigation deficit 75% of F.C.

Two field experiments were carried out during the two successive summer seasons of 2014 and 2015 at the experimental farm of the Environmental Studies And Research Institute, University of Sadat City to study the effect of some chemical, organic and bio fertilizers on seed yield and its components as well as rust disease infection of Kafer EL-Shaikh cawpea cultivar. seven treatments were used in addition to control treatment.. Results indicate the treatment of 50% NPK +Rhizobia + Homic + Microbin and 50% NPK + Rhizobia + Homic were the best among all tested treatments where both of them gave an average high-yield and some of its components compared with the other treatments in both seasonsAs for rust disease, the low percentage of infection has always been linked to the presence of humic acid and in some cases with the compost, on the other hand, the ratio was high percentage of infection in most cases linked to the existence of chemical fertilizer and sometimes the presence of rhizobia, or both together. The treatment 50% NPK + Rhizobia +Homic+Microbin was the best while it give the lowest percentage of infection under the four periods in the two seasons. The recommended added rates were as follows: 50% NPK. (16.5kg N+ 30 kg P 2 O 5 + 25kg K 2 O) +2kg commercial rhizobia + 4L commercial homic +5L commercial microben / feddan.