Potassium release characteristics of microcrystalline potassium mineral and its effects on growth of grain amaranth

doi:10.11686/cyxb2015072

Abstract

Abstract: In order to improve potassium availability, potassium minerals were finely ground in a microcrystalline mill with an organic activator, and the physical properties studied, including kinetics of potassium release and fertilizer efficiency. The results showed that the physical and chemical characteristics of the microcrystalline potassium mineral were improved significantly. Compared to the untreated potassium mineral, the median particle size was decreased by 37.22%, the specific surface area was increased by 194.14% and the total dose of potassium in 60 days was improved by 492.44%. After application of the microcrystalline potassium mineral to soil as fertilizer, plant height, stem diameter and biomass were increased by 12.16%, 20.55% and 13.76%, respectively, compared to the unground potassium mineral treatment. Application of finely ground potassium minerals also raised the levels of soil rapidly available K, and slowly available K, and these differences were statistically significant, compared to application of unground potassium mineral. The stimulation to growth of grain amaranth from a treatment which applied increments of microcrystalline potassium feldspar mineral or a combined application of microcrystalline potassium mineral and potassium chloride was less than that obtained from a conventional potassium chloride fertilizer treatment, but not significantly so (P>0.05).

LV Le-Fu, DOU Xing-Xia, ZHANG Hong-Wei, XIE Xing-Yuan, GAI Guo-Sheng. Potassium release characteristics of microcrystalline potassium mineral and its effects on growth of grain amaranth[J]. Acta Prataculturae Sinica, 2016, 25(1): 126-133.

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