Effects of nitrogen，phosphorus，and potassium gradient fertilization on mercury uptake and accumulation in rice

doi:10.16178/j.issn.0528-9017.20240682

Abstract

Abstract:

To screen suitable fertilization rates for rice cultivation in mercury-contaminated soil，this study established nitrogen gradients ［N content：0（N₀），100 kg·hm^-2（N₁），200 kg·hm^-2（N₂），300 kg·hm^-2（N₃）］，phosphorus gradients ［P₂O₅ content：0（P₀），30 kg·hm^-2（P₁），60 kg·hm^-2（P₂），90 kg·hm^-2（P₃）］，and potassium gradients ［K?O content：0（K₀），75 kg·hm^-2（K₁），150 kg·hm^-2（K₂），225 kg·hm^-2（K₃）］ based on recommended application rates. A pot experiment was conducted to investigate the effects of nitrogen，phosphorus，and potassium gradient fertilization on mercury uptake and accumulation in rice. The results showed that under nitrogen gradients，both the mercury content and accumulation amount in grains and straw initially increased and then decreased with increasing nitrogen application rate，reaching a maximum under the N₁ treatment. Compared with no phosphorus fertilizer，the P₁ and P₃ treatments significantly （p<0.05）increased mercury content in the straw，while no significant difference was observed between the P₂ and P₀ treatments. Under potassium gradients，the K₃ treatment resulted in the lowest accumulation amount of mercury in grains，straws，and aboveground parts. Therefore，it is recommended to adopt a nitrogen application rate of 300 kg·hm^-2，a phosphorus application rate of 60 kg·hm^-2，and a potassium application rate of 225 kg·hm^-2 for rice cultivation in mercury-contaminated soil. Furthermore，the interaction effects of nitrogen，phosphorus，and potassium fertilizers warrant further investigation.

Key words: mercury, nitrogen，phosphorus，and potassium, rice

CLC Number:

S511

XU Zaimeng, LU Chenni, SUN Da, SHI Yanping, CHEN Gui. Effects of nitrogen，phosphorus，and potassium gradient fertilization on mercury uptake and accumulation in rice[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(5): 1214-1220.

Figures/Tables 4

References 19

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处理	每盆产量/g	每盆穗数	每穗粒数	结实率/%	千粒重/g
N₀	36.53±2.80 a	21.00±2.00 a	80.18±7.56 a	93.00±1.94 a	23.43±0.56 b
N₁	40.70±6.24 a	22.00±2.65 a	80.57±2.56 a	93.06±1.42 a	24.62±0.25 a
N₂	39.77±4.31 a	22.89±1.35 a	76.94±8.57 a	94.29±0.54 a	24.08±0.39 ab
N₃	43.45±1.35 a	23.50±0.50 a	81.57±1.35 a	93.79±0.92 a	24.10±0.05 ab
P₀	42.53±7.11 a	22.67±2.52 a	82.47±6.71 a	94.14±1.09 a	24.09±0.48 ab
P₁	34.00±0.26 ab	19.33±2.31 a	73.44±5.71 ab	93.78±2.13 a	25.76±2.00 a
P₂	39.77±4.31 ab	22.89±1.35 a	76.94±8.57 ab	94.29±0.54 a	24.08±0.39 ab
P₃	32.27±2.72 b	22.33±0.58 a	67.23±3.48 b	93.86±0.86 a	22.91±1.57 b
K₀	36.83±1.34 a	22.33±0.58 a	73.48±1.33 a	92.96±1.32 a	24.14±0.33 a
K₁	34.20±3.33 ab	22.00±1.00 a	69.26±3.86 a	93.06±2.19 a	24.09±0.35 a
K₂	39.77±4.31 a	22.89±1.35 a	76.94±8.57 a	94.29±0.54 a	24.08±0.39 a
K₃	28.53±4.01 b	21.67±3.21 a	59.44±2.48 b	92.59±0.89 a	23.97±0.27 a

处理	每盆产量/g	每盆穗数	每穗粒数	结实率/%	千粒重/g
N₀	36.53±2.80 a	21.00±2.00 a	80.18±7.56 a	93.00±1.94 a	23.43±0.56 b
N₁	40.70±6.24 a	22.00±2.65 a	80.57±2.56 a	93.06±1.42 a	24.62±0.25 a
N₂	39.77±4.31 a	22.89±1.35 a	76.94±8.57 a	94.29±0.54 a	24.08±0.39 ab
N₃	43.45±1.35 a	23.50±0.50 a	81.57±1.35 a	93.79±0.92 a	24.10±0.05 ab
P₀	42.53±7.11 a	22.67±2.52 a	82.47±6.71 a	94.14±1.09 a	24.09±0.48 ab
P₁	34.00±0.26 ab	19.33±2.31 a	73.44±5.71 ab	93.78±2.13 a	25.76±2.00 a
P₂	39.77±4.31 ab	22.89±1.35 a	76.94±8.57 ab	94.29±0.54 a	24.08±0.39 ab
P₃	32.27±2.72 b	22.33±0.58 a	67.23±3.48 b	93.86±0.86 a	22.91±1.57 b
K₀	36.83±1.34 a	22.33±0.58 a	73.48±1.33 a	92.96±1.32 a	24.14±0.33 a
K₁	34.20±3.33 ab	22.00±1.00 a	69.26±3.86 a	93.06±2.19 a	24.09±0.35 a
K₂	39.77±4.31 a	22.89±1.35 a	76.94±8.57 a	94.29±0.54 a	24.08±0.39 a
K₃	28.53±4.01 b	21.67±3.21 a	59.44±2.48 b	92.59±0.89 a	23.97±0.27 a