References in periodicals archive
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K was given to the crop through K2SO4 fertilizer (50% K2O) as per treatment plan.
Foliar application of 2 and 5% K2SO4 before silking can significantly improve grain number and grain yield in drought-stressed maize.
A 40 g sample of moist soil was split into two portions shaken at 250 rev/min with 100 ml K2SO4 and filtered.
Soil NH +-N was extracted by 1M KCl and was determined following the procedure of Anderson and Ingram [8] while NO --N was determined colorimetrically after extraction by 0.5 M K2SO4 [9].
All of P, K, S and half of N was applied at the time of sowing in the form of DAP, K2So4, and urea, respectively.
Nitrogen, phosphorus and potassium were given in the form of Urea, DAP and SOP (K2SO4).
Schoenite is a mixed potassium magnesium mineral, with a formula of K2Mg(SO4)2.6(H2O), which is likely to be an intermediate product from this brine, which then requires treatment to extract the potassium sulphate (K2SO4, which is a saleable product).
The composition of solution was: 5 mM Ca (NO3K 1.75 mM K2SO4, 1.25 mM MgSO4, 0.25 mM HCl, 1.5 [micro]M Fe (III)-EDTA, 25 [micro]M [H.sub.3]B[O.sub.3], 1.5 [micro]M ZnS[O.sub.4], 0.5[micro]M CuS[O.sub.4], 0.025[micro]M [(N[H.sub.4]).sub.6][Mo.sub.7][O.sub.24] and 0.25 mM K[H.sub.2]P[O.sub.4].
Nitrogen was determined using mocr-Kjeldahl method using K2SO4 and CuSO4 mixture as digestion catalyst and phosphorus was determined in a spectrohotometer (model Novaspect II).
The nutrient medium with K+ contained the following macronutrients: 0.6 mM NH4NO3, 0.2 mM NH4H2PO4, 0.34 mM K2SO4, 0.34 mM KCl, 0.38 mM Ca(NO3)2, and 0.2 mM MgSO4, and the following micronutrients: 4 uM MnCl2*4H2O, 8 uM H3BO3, 0.12 uM CuSO4*5H2O, 0.3 uM ZnSO4*7H2O, 0.07 uM MoO3, and 20 uM Fe-EDTA.
A uniform fertilizer dose of 200 kg N, 90 kg P2O5 and 90 kg K2SO4 was applied.
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