Document Type : Research articles.
Authors
1
Dept. of Horticulture, Fac. of Agric., Fayoum Univ., Egypt.
2
Dept. of Agric. Botany, Fac. of Agric., Fayoum Univ., Egypt.
Abstract
This investigation was carried out during the two successive
seasons of 2006 and 2007 to investigate the effect of potassium
nitrate, garlic extract and onion extract on bud break, growth, yield
and some chemical constituents of "Anna" apple (Malus sylvestris,
Mill) variety. The trees were grown in loamy sand soil, and sprayed
with six treatments (potassium nitrate 10%), garlic extract (20%),
onion extract (20%), potassium nitrate (5%) mixed with garlic
extract (10%) ,potassium nitrate (5%) mixed with onion extract
(10%) and control. Generally, it was found that all studied growth
parameters, date of flower bud break, percentage of bud break, fruitsetting, fruit weight, fruit size, fruit number/tree, yield/tree (kg) and
some chemical constituents of leaves (total chlorophyll, total
carbohydrates, total protein, nitrogen, phosphorous and potassium
contents) and some chemical constituents of fruits (total soluble
solids (T.S.S.), T.S.S/ acid ratio, vitamin C, water content %, total
free amino acids, total carbohydrates, total sugars and reducing
sugars) were increased with the application of the different
treatments. The best results were obtained from the treatments of
potassium nitrate at 5% mixed with onion extract at 10%, potassium
nitrate at 5% mixed with garlic extract at 10% and potassium nitrate
at 10%. On the contrary, the same treatments decreased total acidity
and total phenols in fruits as compared to the control. It could be
recommended to use potassium nitrate at 5% in combination with
onion extract or garlic extract at 10% for improving bud break,
growth, yield and chemical constituents of apple trees or fruits.
Keywords
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