In this experiment, itaconic acid, maleic acid, acrylic acid, and potassium persulfate were polymerized to form synergist, which was wrapped on the surface of phosphate fertilizer particles to make synergistic phosphate fertilizer. In order to explore synergistic phosphate fertilizer effects on soil nutrient and microbial in wheat (Triticum aestivum), four treatments were designed—CK: nitrogen fertilizer (containing N 306.14 kg/hm2), potassium fertilizer (containing K2O 116.67 kg/hm2), conventional phosphate fertilizer (containing P2O5 333.35 kg/hm2); T1: synergic phosphate fertilizer (containing P2O5 249.99 kg/hm2); T2: synergic phosphate fertilizer (containing P2O5 166.67 kg/hm2); and T3: synergic phosphate fertilizer (containing P2O5 83.32 kg/hm2). The application amount of nitrogen and potassium fertilizer in T1, T2, and T3 was the same as that in CK. The soil nutrient concentration of different treatments was analyzed, and the microbial diversity of different treatments was analyzed by Illumina MISEP high‐throughput sequencing technology. The results showed that the T2 treatment performed the best. In 2020, the pH of T2 was 1.87% lower than that of CK, and the contents of alkali hydrolyzed nitrogen, available phosphorus, and available potassium were 5.8%, 11.44%, and 9.91% higher than CK, respectively. In 2021, the pH of T2 was 1.64% lower than that of CK, and the contents of alkali hydrolyzed nitrogen, available phosphorus, and available potassium were 1.06%, 7.89%, and 16.53% higher than CK, respectively. In addition, the application of synergistic phosphate fertilizer could improve the richness, diversity, and evenness of microorganisms in soil.

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.