Crops ›› 2017, Vol. 33 ›› Issue (3): 104-109.doi: 10.16035/j.issn.1001-7283.2017.03.019

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Effects of Different Potassium-Silicon Fertilizer Application Rate on Rice-Rape Growth, Potassium Absorption and Potassium Balance

Jia Qian,Liao Shipeng,Ren Tao,Li Xiaokun,Zhang Yangyang,Cong Rihuan,Lu Jianwei   

  1. College of Resource and Environment,Huazhong Agricultural University/Key Laboratory of Arable Land Conservation,Middle and Lower Reaches of Yangtse River,Ministry of Agriculture,Wuhan 430070,Hubei,China
  • Received:2017-01-17 Revised:2017-04-10 Online:2017-06-15 Published:2018-08-26
  • Contact: Tao Ren

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Abstract:

A pot experiment was conducted to study the effect of different potassium-silicon fertilizer application rate on rice-rape growth, nutrient absorption and soil potassium balance. The results showed that when potassium application was at 1.5g K2O/pot, there were similar results for potassium-silicon fertilizer and potassium sulfate treatments. Both fertilizers significantly increased the biomass and potassium accumulation of rice and rape, the rice biomass was increased by 41.0%-42.2%, the rape biomass was increased by 19.7%-20.8%. Increase of potassium-silicon fertilizer application by one fold, the rice and rape biomass increased by 46.9% and 21.4%, respectively, which were the highest. When potassium-silicon fertilizer application rate was at 3.0g K2O/pot, the potassium accumulation amount of rice and rape were at the highest, which were 1.36 and 0.54g K2O/pot, respectively. The real nutrient utilization efficiency was reduced with the increase of application rate of potassium-silicon fertilizer. When potassium-silicon fertilizer application rate was at 1.5g K2O/pot and 3.0g K2O/pot, the real nutrient utilization efficiency were 59.1% and 53.5%, respectively. After rice-rape harvest, the partial K balance of potassium sulphate, potassium-silicon fertilizer and two times potassium-silicon fertilizer treatments were 1.1, 0.9 and 0.6, respectively. The soil potassium of potassium sulphate treatment was deficient, the soil potassium of potassium-silicon fertilizer and two times potassium-silicon fertilizer treatments were at surplus. The content of soil available K and slowly available K increased with the application of potassium-silicon fertilizer. The potassium-silicon fertilizer could replace water-soluble potassium fertilizer, the application rate were equal or slightly lower than the same potassium nutrient supply with water-soluble potassium fertilizer. When the second quarter crop is being planted, the potassium-silicon fertilizer and water-soluble potassium fertilizer should be supplied.

Key words: Potassium-silicon fertilizer, Potassium sulphate, Real potassium utilization efficiency, Potassium balance, Soil potassium

Table 1

Effects of different potassium-silicon fertilizer applytion amount on rice-rape biomass and potassium absorption"

作物
Crop		 处理
Treatment		 生物量(g/盆)
Biomass		 产量(g/盆)
Yield		 生物量增加幅度(%)
Increasing biomass rate		 钾素吸收量(g K2O/盆)
K uptake		 土壤钾素依存率(%)
SKDR
水稻Rice K0 54.35b 21.92b - 0.40c -
K1 77.30a 34.40a 42.2 1.24a 32.3
K2 76.62a 36.66a 41.0 1.07b 37.4
K3 79.85a 39.17a 46.9 1.36a 29.4
油菜Rape K0 34.69b 8.38b - 0.19b -
K1 41.89a 10.87a 20.8 0.44a 43.2
K2 41.52a 9.12ab 19.7 0.42a 45.2
K3 42.12a 10.13a 21.4 0.54a 35.2

Table 2

Effects of different potassium-silicon fertilizer applytion amount on real potassium utilization efficiency and partial K balance"

作物
Crop		 处理
Treatment		 钾素利用率(%)
K utilization efficiency		 钾素盈亏量(g K2O/盆)
K surplus and shortage		 偏钾平衡
PKB		 钾素真实利用率(%)
K real utilization efficiency
水稻Rice K0 - -0.40c - -
K1 56.3a 0.26b 0.8a 73.0a
K2 45.0a 0.43b 0.7a 53.2b
K3 32.2b 1.64a 0.4b 49.0b
水稻-油菜轮作 K0 - -0.59d - -
Rice-Rape rotate K1 73.3a -0.18c 1.1a 74.0a
K2 52.0b 0.01b 0.9a 59.1b
K3 43.7b 1.10a 0.6b 53.5b

Table 3

Effects of potassium-silicon fertilizer on soil potassium before and after crop planting"

作物
Crop		 处理
Treatment		 速效钾含量Available K content (mg/kg) 缓效钾含量Slowly available K content (mg/kg)
种植前
Before planting		 种植后
After planting		 降低
Reduction		 种植前
Before planting		 种植后
After planting		 降低
Reduction
水稻Rice K0 91.1d 24.3d 66.8 220.8c 169.0c 51.8
K1 228.9b 74.7b 154.2 382.1b 218.0b 164.1
K2 182.2c 48.7c 133.5 333.5b 205.2b 128.3
K3 259.4a 109.3a 150.1 429.8a 258.5a 171.3
油菜Rape K0 24.3d 22.7b 1.6 169.0c 166.3c 2.7
K1 74.7b 26.9b 47.8 218.0b 210.7b 7.3
K2 48.7c 32.5b 16.2 205.2b 227.6b -22.4
K3 109.3a 46.9a 62.4 258.5a 252.1a 6.4

Fig.1

The relationship between the soil potassium balance and variation of soil potassium"

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