Influence of organic -n sources on some chemical and physical properties of soil, growth, root distribution and leaf npk content of young valencia orange trees grown in sandy soil under drip irrigation [electronic resource].

Includes references.

One year old Valenda orange trees budded on Volkamer lemon rootstock grown in sandy soil located in citrus grove of El-kassasin Horticulture Research station, Ismailia Governorate were fertilized by organic materials (balady, compost, town refuse, biogas and green manure) and mineral fertilizer as ammonium sulphate, as singly or combined treatments. Manures led to decrease in pH, bulk density and significant increase in organic matter content, available NPK in soil with all treatments. The biogas individually or combined with mineral fertilizer gave the optimum values of available NPK in the soil and leaves followed by compost, balady, mineral, town refuse and green manure. Dry weights of roots and vegetative growth increased significantly with combined treatments, as compared with both mineral or single manures. Applying the combined fertilization of mineral and manure to sandy soil led to improving the physical and chemical properties. This improvement was reflected on soil productivity and caused significant efficiency increases of fibrous, skeletal and semi-skeletal roots and vegetative growth under drip irrigation. Superiority of biogas and compost manures over all the studied organic manures in the two studied seasons for NPK uptake, root distribution and vegetative growth can be attributed to their higher content of available NPK.

Summary in Arabic.

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