Effects of stocking density of river crabs on rice growth and soil in low-lying saline-alkali soil

doi:10.14088/j.cnki.issn0439-8114.2025.03.006

Abstract

Abstract: To investigate the effects of river crab stocking density on soil and rice （Oryza sativa L.） growth in low-lying saline soil in Ningxia, the experiment was conducted with no crab stocking as the control, and low density (300 kg/hm²), medium density (450 kg/hm²) and high density (600 kg/hm²) crab treatments were set up to measure the relevant indexes of rice and rhizosphere soil at the tillering, spiking and milky maturity stages of the rice, so as to explore the growth status of rice under different crab stocking density in low-lying saline-alkaline land. The results showed that the low-density crabs stocking treatment could promote the increase of rice plant height and tiller number. From spiking to milky maturity stages of the rice, the medium-density crabs stocking treatment could reduce soil pH by 4.09%, which was significantly different from that of the low-density and high-density crabs stocking treatments (P<0.05), and it could reduce soil conductivity very significantly compared with that of the control group (P<0.01). The rice yield under the high density crabs stocking treatment increased by 14.60% and 5.69% compared with that under the low and medium density crabs stocking treatments, respectively, and the number of filled grains per panicle under this treatment was the highest, which was significantly different from that under the low and medium-density crabs stocking treatments (P<0.05). The rice yield and the number of filled grains per panicle were significantly positively correlated with the percentage of root activity in total absorption, respectively, and soil pH was significantly negatively correlated with soil ammonium nitrogen, available potassium and available phosphorus content（P<0.05 or P<0.01）. The study showed that the medium-density stocking of river crabs could reduce soil pH, and the high-density stocking of river crabs could increase the percentage of root activity in total absorption and filled grains per panicle rice, and promote the increase of yield.

Key words: rice-fishing culture, low-lying saline-alkaline land, stocking density of river crab, rice（Oryza sativa L.）, soil

CLC Number:

WANG Yue, SUN Yi-xin, LEI Jing-yang, MA Qiao-ling, TAO Ying, YUAN Na-na, YANG Juan, WANG Bin, SHI Wei. Effects of stocking density of river crabs on rice growth and soil in low-lying saline-alkali soil[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(3): 36-43.

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