Two Factorial field experiments on wheat (Var. Msr2) were
conducted during two successive seasons (2015/2016 and
2016/2017).The factors involved gypsum application (none, 100%
gypsum requirements) × organic fertilizer rate (none, 20 m3 fed-1) ×
nitrogen fertilizer rates (none, 100 kg N fed-1) × zinc fertilizer rates
(none, 5 kg Zn fed-1) × 4 replicates. The soils of the experimental
locations have been clay loam in texture and the mean values of some
properties were ECe = 6.40 dS.m-1, ESP = 18.11 % , pH = 8.30 which
reveals higher effects with salinity and sodicity.
The important results could be summarized as follows:
1- The addition of gypsum according to soil gypsum requirements (GR)
prior wheat cultivation resulted in higher wheat yields as a result of
its ameliorative role in soil-pH; soil-EC; soil-ESP and subsequently
increasing the availability of some nutrients.
2- Better wheat yields have been obtained by adding organic manure of
20 m3 fed-1 compost, as a result of modifying various soil physicochemicals
characteristics and subsequently increasing most nutrients
availability.
3- Nitrogen fertilization with the recommended rate of 100 kg N fed-1 (as
Ammonium sulfate) led to higher wheat yields as compared to nonefertilized
treatment.
4- Zinc sulfate fertilization at rate of 5 kg Zn fed-1 for wheat led to better
yields; where that response is related to native Zn- unavailability due
to higher values of soil-pH and soil- ESP.
5- The significant interaction of those variables on wheat yield and wheat
grains-N and Zn concentrations as well as protein content revealed that
their use efficiencies have been affected with each other. The coadditions
of (GR)×organic manure × N-fertilizer ×Zn fertilizer were
344 GENEDY et al.
highly beneficial in improving N and Zn nutrition for wheat yield in
such soils.