Authors:
Hanaa A. Zein El-Abdeen, Gehan H. Youssef, Suzan A. El Sayed, Marwa, A. H. Shady |
Abstract:
The main problems of sandy soil are its inability to hold on to nutrients, its fast drainage, its lack
of soil structure and its small buffering capacity. It cannot hold on to nutrients because it has
little or no clay and organic matter. Therefore, the objective of this study was to determine the
effect of the combined application of some synthetic soil conditioners with two forms of humic
acids (HA) as organic soil conditioners in reducing nitrogen fertilizer requirements to maximize
wheat yield productivity. So, two experiments were designed in a split-split plot design with
three replicates at the Experimental Station Farm in El-Ismailia governorate during the two
successive winter seasons using wheat plant (Triticum Sativacv Giza 168). The treatments
included two forms of organic acids and synthetic soil conditioners in the presence of three
levels of nitrogen fertilizer. The common agricultural practices for growing wheat according to
the recommendations of the Ministry of Agriculture were followed.
Obtained results revealed that the application of humic acids type either HK or HCa in
combination with PVA or bitumen emulsion under different application rates of nitrogen
fertilizers enhanced wheat plant productivity (yield, straw, and grains kg/fed) along with uptake
macronutrient as compared to control treatment. The superior one was HCa in combination with
PVA and B in presence of 75% N application in the first and second season, respectively.
Moreover, soil fertility was improved by adding soil conditioners in different forms with/without
nitrogen fertilizers as compared to the control treatment i.e. EC values, OM, and available NPK
were significantly increased in all treatments applied; the maximum increase was observed with
HCa combination with B at 75% from nitrogen dose. Also, the same trend was observed with dry stable aggregates and total porosity of sandy soil for an average of two seasons. An opposite
trend was observed with bulk density whose values generally decreased with all treatments.
In conclusion, can be clarified that the application of humic materials either HK or HCa was
increasing soil fertility which is reflected in wheat plant productivity but it was more efficient
when in combination with synthetic polymers especially B, and can save about 25% from
nitrogen fertilizer applied. |
