Selecting the optimum amount of organic, mineral and biofertilizers responsible for maximizing the productivity of balady guava trees [electronic resource].

Includes reference.

The effect of supplying Balady guava trees with N at 400 gltree from mineral source, filter cake mud and Bio Azotene in various percentages on leaf area, total chlorophylls, total carbohydrates, percentages of N, P, K and Mg, yield and fruit quality was studied during 2004 and 2005 seasons. Nitrogen at the fixed rate namely 400 g/tree was applied either completely from mineral (ammonium sulphate), filter cake mud (2% N} and Bio Azotene sources or in various proportions of each. Results showed that combined application with N through mineral, filter cake mud and Bio Azotene was effective in improving leaf area, total chlorophylls, total carbohydrates, percentages of N, P, K and Mg in the leaves, yield and fruit quality compared to using each source lower than 50% out of the recommended N. Application of N completely via organic or biofertilizer form caused a reduction in the above-mentioned traits compared to using N completely via mineral source. Application of Bio Azotene alone was favourable than using filter cake mud in this connection.

Summary in Arabic.

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