Water retention agents have been applied to agricultural fields to improve the growing conditions of crops, but the potential of these agents in saline soils is poorly understood. The effects of compound water retention agents on nutrient content and soil microbial diversity of saline winter wheat soils were investigated in a field experiment with no water retention agent (CK) and 30 kg hm2 of commercial attapulgite water retention agent (T4) as control and different amounts of compound water retention agents as treatments (15 kg hm2-T1, 30 kg hm2-T2, 45 kg hm2-T3). The study showed that the application of water retention agents increased the soil water content. From anthesis to harvest stage, the decreases in soil alkali-hydrolyzed nitrogen, available phosphorus, available potassium and organic matter content were greater in T2 and T3 than in the other treatments. At harvest stage, the alkali-hydrolyzed nitrogen content of T2 was significantly lower than that of CK and T4 6.19–8.83% and 4.62–5.39%, respectively. The soil available phosphorus content of T2 was significantly lower than that of CK 8.14–8.83%. The relative abundance of Actinobacteria, Proteobacteria and Acidobacteria as well as the Shannon and Simpson indices of T2 reached their maximum at harvest stage. T2 showed the best performance in terms of overall number of OTUs. The compound water retention agent may regulate soil nutrient content and accelerate plant nutrient accumulation by regulating soil water content and soil microbial abundance composition. Graphical abstract
Effects of different dosages of potassium silicate fertilizer on photosynthetic characteristics and yield of winter wheat under field conditions were studied. Four different dosages: 0, 45, 90 and 135kg/ha were applied. Results showed that the chlorophyll content, net photosynthetic rate of wheat flag leaf firstly increased and then decreased with the increase of levels of potassium silicate fertilizer. By the change of SPAD values after flowering, when the application of potassium silicate fertilizer was 90 kg/ha, the existence time of chlorophyll in flag leaf was significantly long, and the net photosynthetic rate was significantly increased. The 1000-grain weight of winter wheat significantly increased and the yield the highest. Overall, when the applied amount of potassium silicate fertilizer was 90 kg/ha, the performances of winter wheat were best. Bangladesh J. Bot. 50(4): 1127-1132, 2021 (December)
In order to explore the effect of potassium silicate fertilizer on soil nutrient content and silicon content in winter wheat in the open field. The experimental variety is Jimai22. 4 different potassium silicate fertilizer rates were applied as Control (CK, 0kg/hm), Treatment 1 (T1, 45 kg/hm), Treatment 2 (T2, 90kg/hm), Treatment 3 (T3, 135kg/hm). The effects of potassium silicate fertilizer on soil nutrient (soil moisture content, pH, alkali solution nitrogen, available phosphorus, available potassium) and silicon (all silicon, available silicon) content in wheat growth stages were studied. Experimental results show that: The soil moisture content of T1, T2 and T3 was significantly higher than that of CK, among them, there were soil moisture content in each period highest in T2, soil pH is closer to neutral, thereby alleviating the problem of soil acidification; The nutrient content of T2 soil was significantly higher than that of CK; The content of silicon in the soil is proportional to the amount of potassium silicate fertilizer applied, there were silicon content highest in T3. Under the conditions of this experiment, it is recommended that the application rate of potassium silicate fertilizer is 90kg/hm in winter wheat in the open field.
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