Residual effects of different organic and inorganic fertilizers on spinach (Spinacia oleracea L.) plant grown on clay and sandy soils [electronic resource].

Includes reference.

The present study aims to residnal effects of composts (plant residues, animal residues and mixed) with and without inorganic fertilizer on spinach (spinicia oleracea L.) plants and soils. The obtained resnlts showed that the finished compost of plant residues was high iD germination index (GI) and low in CIN ratio compared with the other composts. The study demonstrated that the spinach yield with 50% N mineral + 50% N organic treatments were higher than the other treatments in the clay and sandy soils especially with the plant compost. ne high nitrate accumulation of spinach plants was found in organic andinorganic combinations fertilizen compared with inorganic fertilizer, where as, the nitrate concentrations in the of spinach leaves was lower than the acceptable limit of WHO. ne nitrogen and phosphorus remaiDed in the study solis increased with the increase of organic nitrogeD applied as well as soil organic C. The combinations of organic and inorganic fertilizen to solis had a greater effect on increasing yield and improvement of the soil fertility.

Summary in Arabic.