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- Title
Effects of long-term applying sulfur-and chloride-containing chemical fertilizers on weed growth in paddy field.
- Authors
SHEN Pu; GAO Ju-sheng; XU Ming-gang; LI Dong-chu; NIU De-kui; QIN Dao-zhu
- Abstract
An investigation was made at a double鄄rice paddy field in the Qiyang Red Soil Field Experimental Station, Hunan Province, China to study the species and biomass of weeds growing in rice (Oryza sativa L. ) growth season after 34鄄year application of sulfur (SO4 2- ) and chloride (Cl-)鄄containing chemical fertilizers under the same application rates of nitrogen (N), phosphorus (P), and potassium (K). Long鄄term application of Cl-鄄containing chemical fertilizer resulted in the greatest species number of weeds and the highest biomass of floating weeds and wet weeds, compared with long鄄term application of SO4 2- and Cl- +SO4 2-鄄containing chemical fertilizers. In early rice growth season, the biomass of weeds after applying Cl-鄄containing chemical fertilizer was 51郾4% and 17郾6% higher than that after applying Cl- +SO4 2- and SO4 2-鄄containing chemical fertilizers, respectively; in late rice growth season, the increment was 144% and 242%, respectively.More floating weeds were observed after applying Cl- +SO4 2- and SO4 2-鄄containing chemical fertilizers, but few of them were found after applying Cl-鄄containing chemical fertilizer. The total dry mass of weeds and the dry mass of wet weeds were positively correlated with soil Cl- content (r =0郾764, P<0郾01 and r =0郾948, P<0郾01, respectively), but negatively correlated with soil SO4 2-鄄S content (r =0郾849, P<0郾01 and r =0郾641, P<0郾05). Soil alkali鄄hydrolyzable N and available P, under the co鄄effects of soil SO4 2-鄄S, Cl-, and pH, had indirect effects on the total dry mass of weeds. By adopting various fertilization measures to maintain proper soil pH and alkali鄄hydrolyzable N and available P contents, increase soil SO4 2-鄄S content, and decrease soil Cl- content, it could be possible to effectively inhibit the growth of wet weeds and to decrease the total biomass of weeds in double鄄rice paddy field.
- Subjects
FERTILIZERS &; the environment; SULFUR fertilizers; WEEDS; BIOMASS; RICE; PLANTING; CHLORIDES
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 4, p992
- ISSN
1001-9332
- Publication type
Article