SELECTING THE OPTIMUM AMOUNT OF ORGANIC, MINERAL AND BIOFERTILIZERS RESPONSIBLE FOR MAXIMIZING THE PRODUCTIVITY OF BALADY GUAVA TREES

Document Type : Research articles.

Author

Hort. Dept., Fac. Agric., South valley University, Egypt.

Abstract

The effect of supplying Balady guava trees with N at 400 g/tree
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.
Generally, fertilizing Balady guava trees with N at 400 g/tree in
the form of 972 g ammonium sulphate + 5.0 kg filter cake mud +
12.5g Bio Azotene/ tree gave satisfactory promoted yield and fruit
quality of guava trees.

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