Property Assessment Complying with the Organic Fertilizer Standard of Department of Agriculture and Plant Nutrient Release of Leonardite - based Organic Fertilizers
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This research aimed to study property following the organic fertilizer standard of Department of Agriculture (std. DOA) of six leonardite - based organic fertilizers (SuperLeo) obtained by mixing 40 - 45 % by weight of leonardite and 55 - 60 % other additives i.e. rice husk biochar (25 - 35 %) or peanut shell biochar (25 - 35 %) + rice bran (25 %) or soybean meal (20 %) + dolomite (0 - 10 %). The release kinetics of extractable (Water - ext.) N, P and K by deionized (DI), acid or alkaline water were determined at various desorption time periods (DT) to be used as a preliminary information to assess the environmental impact. Results showed that all fertilizer formulas had organic matter contents ranged from 28 to 46 %, higher than the std. DOA value (20 %). The properties of all fertilizers met the std. DOA, except pH and germination index values in some formulas. The release patterns of Water - ext. N, P and K were different from each other. The release of Water - ext. N was slow, and the relative release (RR) was < 0.5 % at every DT. The release of Water - ext. P was initially slow and increased with increasing DT. The RR varied from 0.2 to 70 %. The Water-ext. K released rapidly and trended to decrease with increasing DT. The RR ranged from 43 to 80 %. The amount of Water-ext. N, P and K were highest when extracted by DI water while alkaline water could extract the lowest amount of Water - ext. P. Based on the fertilizer’s properties and the Water - ext. N , P and K release patterns, the SuperLeo fertilizers could be considered as an environmentally friendly fertilizer.
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