الفهرس 
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Abstract
The experimental work was conducted aiming at evaluating the response of wheat and maize plants to some fertilization treatments in a calcareous soil (El-Noubaria). To fulfill the purpose of the current research, three similarly experimental sites were chosen in a private farm located western El-Noubaria. Their CaCO3 contents exceed 34%. The first experimental site was manured with cattle waste manure (CWM) whereas the second one was manured with saw dust compost (SDC) while the third one was manured with olive mill compost (OMC). Each of studied sites was divided into three divisions received elemental sulphur at rates of 0, 50 and 100% of the recommended dose (100 kg fed’) during the preparation before planting. Each division was subdivided into three equal areas each of which received 120 kg fee 100%) of the recommended dose) either in forms of urea (46% N), NH4NO3 (33.5% N) or (NH4)2SO4 (20.5% N). Finally, each area was further subdivided into 3 plots received the calcium superphosphate fertilizer (15.5 P2O5) at a rate of 0, 50 and 100% of the recommended P dose (150 kg fed-’). The experimental plots were distributed in split-split design.
At the first season, wheat (Triticum aestivum L., Giza 163) was cultivated while maize (Zea maize L., single hybrid 10) planted at the second season, to study the residual effect of the aforementioned treatments.
The obtained results could be summarized in the followings:-
5.1. Effect of the different applied mineral fertilizer treatments and organic manures on soil chemical properties:
Effect of the elemental sulphur:
Applied elemental sulphur slightly increased EC values, content of soluble HCO3-, SO42-, Ca2+ and organic matter content. At the same time it was inversely affected the pH values, Cl- content, SAR and ESP. The increase in available N, P and K contents seemed more obvious with increasing sulphur applied rate. The obtained available contents of both the elements were higher after wheat than after maize.
Effect of the nitrogenous forms:
Application of nitrogen in the urea form lowered the EC values, 5042- and Mg2+ concentrations and organic matter content, while it caused an increase in soil pH values, HCO3-, Na+ and Cl” content, SAR and ESP values. All these parameters were in a contrary with those obtained under ammonium nitrate or sulphate. Application of urea form was associated with the lowest contents of the available phosphorus and potassium
Effect of the applied phosphorus:
Increasing rate of the applied phosphorus seemed to affect the EC values depending upon the associated rates of the applied sulphure and the nitrogenous form. There were a pronounced effect on concentrations of soluble Mg2+, Na+, K+ and slightly decreased
soil pH, SAR, ESP and CaCO3 content. The organic matter content increased with increasing rate of the applied phosphorus.
5.2. Effect of the applied different fertilization treatments on wheat and maize yields:
The higher the rate of the applied sulphur the higher the grain, straw and biological yields of both the cultivated crops. Nitrogen applied in the ammonium nitrate resulted in higher yield components than that applied in the form of ammonium nitrate and urea which resulted in the lowest yield components. Wheat and maize grain yields exhibited a similar trend to that of their straw yields in relation to P fertilization rate. Organic manures can be arranged descendingly according to their effect on the yield components as follows: cattle waste manure> olive mill compost> sawdust compost.