Effect of application of agriculture organic wastes on properties of sandy soils and the impact on maize and barley grown on the soil .2.- soil contents of available N, P and K; maize and barley growth and nutrients uptake

A sandy soil from Meet Kenana, Qalyoubia Governorate was used in the current study Four sources of organic wastes were used; i.e. chicken manure (CM), chaired rice straw (CRS), sugar beet residue compost (SEC) and sugar line (SL). The letter is a waste sludge of lime-rich material residual from beet sugar factories. Rates of applications were 2%, 4 % and 8 % w/w equivalent to 10, 20, and 40 metric tons / fed., on the basis of 30 cm soil depth under field conditions. Pots of 5 kg capacity were used and watered to about the water-holding capacity and left for one month to allow the biodegradation Watering was done weekly. Then after, 20 grains of maize (Zea mays cv. hybrid 2 Taba) war sown and plants grew for 45 days then cut; thenaflar second crop of barley (Hordum vulgare cv. Giza. 123) was sown (20 grain / pot) in the same pots for another 45 days. After cutting each crop soil samples were taken for determination of available N, P and K con tents. The dray weight of both maize and barley seedling was recorded. The obtained results could be summarized as follows: 1- All materials, except CRS treatment, significantly increased availability of N, P, and K in the soil as well as the dry matter yield of maize and barley. CRS application decreased available nutrients in soil, but significantly increased the dry matter yield of plants. Available nutrients contents after barley cutting were lower than that after maize harvesting, but still higher than that of the untreated soil. 2- All residues increased N, P K, Fe, Mn, and Zn uptake by maize and barley seedlings, except with CRS which decreased such uptake in barley. The decrease was particularly significant with P, Mn and Zn. Uptake of macronutrients by maize and barley seedlings followed a trend almost similar to that of the availability of macronutrients in soil, effects being also dependent on the kind and rate of applied material. 3- Utilization of these organic wastes as a soil conditioners in newly reclaimed sandy soils are recopmmended.