Role of biological potash fertilizer in plant nutrition and potassium balance of soil.
1988
Shen Zhongquan | Guo Yuntao | Liu Liangxue
Rice straw, sunflower (fresh plant) and Alternanthera philoxeroides can strongly absorb potassium from soil and accumulate k relatively high in its tissue. To investigate the mechanism of K-enriching capacity of bio-K fertilizer and its influence on crop yield, those were used in pot and field experiments. By applying the bio-K fertilizers to potassium deficient soils, the yield average percentage increased was 17.5 plus or minus 8.2% for rice grain and 11.7% for lint cotton as compared with control. The K+ in soil could be mantained by organic matter supplied as bio-K fertilizers. As a result, the loss of K+ from soil was decreased by 40%, this benefit was more markedly for sandy soils. Data from long-term experiment for four years showed that the K in soil appeared to be somewhat depleted, as compared with its origin content, this unbalance is mainly due to the K removed by crops excessing the K supply (90 KgK20/ha per year). However, the K consumed could be partly returned to soil by the use of bio-K fertilizers.
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