The effect of sulfur on the response of cotton to urea under alkali soil conditions in pot experiments

Abstract

KEY WORDSAlkalin soil Ammonium Ammonium nitrate Ammonium sulfate Application method Cotton cultivars Incubation Nitrate Nitrate N loss Phytotoxiceffect Sulfur Urea SUMMARYThe effect of sulfur (S) placement and S rate on the efficiency of urea (U) relative to ammonium sulfate (AS) and ammonium nitrate (AN) for cotton were examined in a pot experiment using sandy clay loam soil (pH 7.9). The results showed that AS and AN application in the absence of S increased the yield than U partly because U-induced damage to plants. The combined application of the N sources with S increased the yields and that, the placement of S in the seed horizon in contact with N was more effective than mixing throughout the soil especially with U. These effects were observed with three cotton cultivars. The addition of S to a maximum of 1.5 g/pot gave further increases in yields or the N content of leaves for U, AS or AN. Using the least squares method, it was found that the presence orS significantly increased the efficiency of U than AS or AN. Incubation of S and the N sources with S in the soil was carried out to understand the growth conditions of cotton fertilized by U in alkalin soil. In the case of U-soil system, the pH increased. NO2-N accumulated and considerable loss of N took place. The pH, NO2-N accumulation and the loss of N decreased with S increments.

Effect of Molybdenum, Phosphorus and Sulfur on Yield and Elements Content in Leaves of Wheat Grown in Saline Soil

“…This is most probably due to healthy soil environment for plant growth (Ali et al, 2012). The main action of S is minimizing the soil pH and this will minimize the possibility of NH 3 loss by volatilization or the accumulation of nitrite and consequently the gaseous loss of N due to its presence (Nasseem and Nasrallah, 1981).Table (3) showed that grain yield of wheat increased gradually as the application of P increased. It is increased by 1.17, 1.75 and 1.34% for rated of 7.5, 15 and 22.5 kg P/fed, respectively, relative to the control treatment.…”

Effect of Sulphur Application on the Availability of some Nutrients in Egyptian Soils

“…Regarding to the effect of S treatments on the soluble sulphate, the results in the Table 4 show that the highest value of sulphate was at 2% S as compared with the other levels of elemental S. This may be due to the highest reduction in soil pH, and the transformation of S to sulphuric acid by soil microorganisms. In this respect, Nasseem and Nasrallah (1981) showed that the applied S is slowly oxidized at a low rate and it may be affected by the activity of sulphur oxidation microorganisms in soil. Generally, it could be concluded that the highest amount of sulphate was found with fine particle size of elemental S treatment in all soils under consideration.…”