The northern soil potassium supply capacity and potash fertilizer high-efficiency application technology research won the first prize of scientific and technical achievements of the Ministry of Agriculture in 1999 and the second prize of national scientific and technological achievements in 2000.
The project was jointly supported by the China-Canadian Intergovernmental Cooperation Project and the National Natural Science Foundation of China. It was jointly developed by the China Academy of Agricultural Sciences Soil and Fertilizer Research Institutes and other nine research institutes for six years to carry out potassium supply capacity for the major soils in northern China. Researches on major issues such as the effective application conditions and techniques of potash fertilizer have formed influential scientific research results. The main characteristics of this result are as follows:
1. It is revealed that the potassium supply capacity and potential of major soils in the north have a tendency to decrease from west to east, while the adsorption and fixation ability of the soil to the potassium gradually increases from west to east and the zonal distribution and soil weathering and different clay minerals The internal link of content.
2. Under potting depletion conditions, mineral potassium, which accounts for more than 90% of total potassium in the soil, also contributes greatly to plant uptake, indicating that mineral potassium in soils with weaker weathering in northern China is also an important potassium source for plant absorption.
3. The three processes of soil intrinsic potassium release and soil exogenous potassium adsorption and desorption can be fitted by the first-order reaction equation. The parameters can be used to evaluate soil potassium supply capacity.
4. After more than 1,350 field trial demonstrations and 197 potted trials, it was found that potassium deficiency in the northeast and north China regions has become a limiting factor for high crop yields. The critical value of potassium application under various crops with high yield conditions was determined, with food crops of 80-90 mg/L and vegetables, oil and fiber crops of 100-120 mg/L.
5. Through the determination of soil available potassium content in more than 8500 plough soil samples, the available potassium from the northeast and north China is lower than 80mg/L, accounting for 60.6% and 66.2% of the total soil samples in the area, and less than 100mg/ L accounted for 78.4% and 82.6%, respectively; while soil available from the northwest where soil available potassium was greater than 100mg/L accounted for 83.7% of the total soil samples in the area. Based on the results of field trials, a six-level grading standard for soil available potassium was developed to classify soil potassium supply capacity in the north.
6. Developed a "Northern Soil Potassium Geographical Information System" (NCSKIS) to draw a "Northern Soil Potassium Classification Information Map."
7. The status of potassium recycling and balance in the soil-crop system under the main planting system was clarified, and the effects of straw return and potash fertilizer application on potassium balance regulation and yield increase were revealed.
8. Determined the effect of potassium application and potassium fertilizer application on 38 crops in northeast and north China. The suitable potassium fertilizer for high-yield food crops is 100-150 kg k2O/hm2, and the ratio of N:P2O5:K2O is 1:0.4-0.6:0.6-0.9. The effective application conditions of potash fertilizers were clarified, and a highly efficient potassium application technology system for the soil-based crops in northern China was formed.
From 1993 to 1995, the achievements were extended to 2,951,600 hectares; from 1996 to 1998, 8,811,700 hectares were promoted, and in three years, the net economic benefits were 376.319 million yuan.
The project was jointly supported by the China-Canadian Intergovernmental Cooperation Project and the National Natural Science Foundation of China. It was jointly developed by the China Academy of Agricultural Sciences Soil and Fertilizer Research Institutes and other nine research institutes for six years to carry out potassium supply capacity for the major soils in northern China. Researches on major issues such as the effective application conditions and techniques of potash fertilizer have formed influential scientific research results. The main characteristics of this result are as follows:
1. It is revealed that the potassium supply capacity and potential of major soils in the north have a tendency to decrease from west to east, while the adsorption and fixation ability of the soil to the potassium gradually increases from west to east and the zonal distribution and soil weathering and different clay minerals The internal link of content.
2. Under potting depletion conditions, mineral potassium, which accounts for more than 90% of total potassium in the soil, also contributes greatly to plant uptake, indicating that mineral potassium in soils with weaker weathering in northern China is also an important potassium source for plant absorption.
3. The three processes of soil intrinsic potassium release and soil exogenous potassium adsorption and desorption can be fitted by the first-order reaction equation. The parameters can be used to evaluate soil potassium supply capacity.
4. After more than 1,350 field trial demonstrations and 197 potted trials, it was found that potassium deficiency in the northeast and north China regions has become a limiting factor for high crop yields. The critical value of potassium application under various crops with high yield conditions was determined, with food crops of 80-90 mg/L and vegetables, oil and fiber crops of 100-120 mg/L.
5. Through the determination of soil available potassium content in more than 8500 plough soil samples, the available potassium from the northeast and north China is lower than 80mg/L, accounting for 60.6% and 66.2% of the total soil samples in the area, and less than 100mg/ L accounted for 78.4% and 82.6%, respectively; while soil available from the northwest where soil available potassium was greater than 100mg/L accounted for 83.7% of the total soil samples in the area. Based on the results of field trials, a six-level grading standard for soil available potassium was developed to classify soil potassium supply capacity in the north.
6. Developed a "Northern Soil Potassium Geographical Information System" (NCSKIS) to draw a "Northern Soil Potassium Classification Information Map."
7. The status of potassium recycling and balance in the soil-crop system under the main planting system was clarified, and the effects of straw return and potash fertilizer application on potassium balance regulation and yield increase were revealed.
8. Determined the effect of potassium application and potassium fertilizer application on 38 crops in northeast and north China. The suitable potassium fertilizer for high-yield food crops is 100-150 kg k2O/hm2, and the ratio of N:P2O5:K2O is 1:0.4-0.6:0.6-0.9. The effective application conditions of potash fertilizers were clarified, and a highly efficient potassium application technology system for the soil-based crops in northern China was formed.
From 1993 to 1995, the achievements were extended to 2,951,600 hectares; from 1996 to 1998, 8,811,700 hectares were promoted, and in three years, the net economic benefits were 376.319 million yuan.
Veterinary drugs constitute a large group of compounds, it includes antibiotics, anthelmintics, hormones and nonsteroidal antiinflammatory drugs (NSAIDs) among others. They are used to treat sick animals but also as growth promoters in healthy individuals
New Animal Drug;Veterinary Products;Veterinary Medicine;Veterinary Medicine Drugs,Veterinary Drug Material
Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com