Effects of Bio-active Humic Acid Fertilizer on Phosphorus Leach-loss and Runoff- loss under Simulated Conditions

doi:10.3969/j.issn.1000-6362.2017.11.002

Abstract

Abstract: The movability of phosphorus (P) in the vertical and horizontal directions was investigated with the application of bio-active humic acid fertilizer (BHA) under simulated leaching and runoff experiments. Outdoor leaching and runoff experiments were also conducted with the Chinese cabbage planting, in which the effects of BHA on the growth and yields of the Chinese cabbage and their risk on the water quality were investigated as well. Treatments with chemical fertilizer (CF) and no phosphorus application (NOP) were carried out as control. The results showed that, (1) after watering for eight times, the highest and average value of TP content in the water for BHA treatment were higher than that for CF and NOP treatments, both in simulated leaching and runoff experiments; but there were no significant difference on P leach-loss amount and leach-loss rate among the three treatments. Also there was no significant difference on P runoff-loss amount and runoff-loss rate between BHA and CF treatments. Nevertheless, P runoff-loss amount and runoff-loss rate for the two treatments were both significant higher than that for the NOP treatment (P runoff-loss amount of BHA and CF treatment was 208.96% and 147.01% higher than NOP treatment, respectively; and P runoff-loss rate of BHA and CF treatment was 1.98% and 1.39% higher than NOP treatment, respectively). (2) As for the outdoor leaching and runoff experiments, there was no significant difference on growth status of the Chinese cabbage between BHA and CF treatment, and both of them were significantly better than that for NOP treatment. Moreover, the yield of the Chinese cabbage and the P content in the vegetable were significantly higher in the CF treatment than that in the BHA and NOP treatment. There was no significant difference on P leach-loss amounts between BHA and CF treatment, while both of them were significant higher than NOP treatment. Nevertheless, P runoff-loss amount of BHA treatment was significant higher than that with CF and NOP treatments (78.52% and 82.48%, respectively). As a result, it was pointed out that, although P in CF treatment was easier to be absorbed by Chinese cabbage than BHA treatment, the two treatments showed no significant differences on the growth of vegetables. P loss was easier from runoff solution rather than leaching solution after BHA was applied, and thus it was suggested that immediate irrigation, especially broad irrigation, should be avoided.

Key words: Bio-active Humic Acid, Phosphorus, Leaching, Runoff, Eutrophication

MA Jin-feng, ZHU Chang-xiong, LI Hong-na, GENG Bing, ZHANG Li, SHA Jing-jing. Effects of Bio-active Humic Acid Fertilizer on Phosphorus Leach-loss and Runoff- loss under Simulated Conditions[J]. Chinese Journal of Agrometeorology, 2017, 38(11): 699-708.

References

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