Authors
1
Hort. Res. Instit., Agric. Res. Center, Giza, Egypt
2
Soils and Water use Dept. National Res. Center, Dokki, Giza.
3
Plant Nutrition Dept. National Res. Center, Dokki, Giza.
Abstract
The investigation was carried out during two successive seasons
2008 and 2009 on Valencia orange trees twenty years old, budded on sour
orange rootstock at three types of soil i.e, silty loam of a private citrus
orchard of Belbais, Sharkia governorate, loamy sand of a private farm of
Abshway, Fayoum governorate and sandy soil at El- Horia farm at ElNobaria sector, El-Behera governorate to study the effect of different
sources of organic manure fertilizers i.e. (poultry manure, sheep manure,
cattle manure, sewage sludge compost and town waste compost at the rate
of 71.4 kg/tree, Rock phosphate (24.5%P2O5) was the source of phosphate
fertilizer and Felspar (7.9%K2O)was the source of potassium on
comparing with mineral fertilizer [ 800gm ammonium sulphate 20.5%N,
400gm Calcium super phosphate 15.5%P2o5 and 400gm Potassium
sulphate 48%K2O] per tree on vegetative growth, leaf (water, pigment and
mineral) contents, fruiting parameters (fruit set, June drop and fruiting)
percentage, yield and fruit quality. In addition the amounts of N,NH4,
NO3,P,K,Fe, Mn, Zn and Cu that remained in each studied soil at the end
of the experiment were also studied. The obtained results revealed that
vegetative growth, leaf water, chlorophylls and mineral contents, fruit set,
fruiting, yield and fruit quality significantly increased as a result of
organic manure addition specially when using poultry manure, whereas,
leaf carotene and June drop %were lowered. Silty loam soil was the best
on affecting trees growth followed by loamy sand whereas sandy soil was
the lowest. Adding poultry manure led to an increase in soil N,NH4 and
P, whereas , using chemical fertilizers led to an increase in soil NO3 .
Applying cattle manure led to an increase in soil K and Fe. The main
observation was that using Town waste compost led to an increase in soil
Zn and Cu.
Keywords
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