Journal of Food, Agriculture and Environment

The effect of Chinese mitten crab larva on water quality parameters in different rice growth stages in rice-crab culture systems

Author(s):

Yongchao Yang ^{1, 2, 3}, Yunjie Zhang ^{1, 2, 3, 4}, Xuzhou Ma ^{1, 2, 3}*, Ang Wang ^{1, 2, 3}, Weiqun Lv ^{1, 2, 3}, Wu Wang ^{1, 2, 3}, Yan Li ^{1, 2, 3, 4}, Fei Wang ^{1, 2, 3, 5}

Recieved Date: 2014-01-20, Accepted Date: 2014-03-28

Abstract:

Rice-crab system as a new eco-culture system has only been trailed in several areas, especially in northeast of China. In order to better understand such eco-culture system, rice-crab culture experiment was conducted to determine the diel fluctuation of water quality, i.e. dissolved oxygen (DO), water temperature (T) and pH under different crab larvae stocking density (1) rice monoculture (RM), (2) rice-crab with 500 crab larvae (RCL), (3) rice-crab with 1500 crab larvae (RCH) at four rice growth stages (tillering, jointing, flowering and filling stage). The result showed that dissolved oxygen and pH exhibited significant difference (p<0.05) at flowering and filling stage between rice-crab culture and rice monoculture, it indicated that the presence of crab decreased DO and pH. Temperature did not change significantly through rice growing seasons. The results also showed that the concentration of nitrogen was high after fertilizing and then descended rapidly, for rice utilizes nitrogen most at tillering stage. At jointing stage, concentrations of NO₃-N and NO₂-N showed significant difference (p<0.05). At filling stage, concentrations of NO₂-N and NH₄-N had significant difference (p<0.05) among treatments. PO₄-P did not differ significantly (p>0.05) from each other at any rice growth stages. Concentrations of nitrogen and phosphorus in high stocking density were higher than two other treatments. Moreover, there was no significant effect of presence of crab on yield of rice paddy during the year, probably due to the mechanism of “Uninterruptible fertilization” (UPF), yield of rice-crab had a little improvement compare with rice monoculture. In general, low stocking density was considered reasonable in rice-crab culture system.

Keywords:

Rice-crab culture, water quality, stocking density, uninterruptible fertilization

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 1368-1373

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