Study Of Optimal Nutrient Management On Sweet Pepper Typical In A Planting Areas Of Fujian

The scientific nutrient management strategy is an important means to maintain high quality and high yield of crops and efficient use of resources.The irrational application of nutrient resources in production severely restricts the sustainable development of the vegetable industry.In this study,the typical planting area of sweet pepper in Fujian facilities（Zhao’an County）was used as the research area.Through investigation and analysis,the soil nutrient content and environmental effects in the planting area were clarified.Based on this,an optimized nutrient management strategy was formulated and the nitrogen,phosphorus,and potassium were specified The potential for saving fertilizer and increasing efficiency and the scientific dosage of magnesium fertilizer under different application methods provide theoretical basis and technical support for the rational application of nutrient resources in the production of sweet peppers in facilities in Zhao’an County.The results were shown as follow:（1）The average inputs of nitrogen,phosphorus,and potassium in sweet pepper planting areas in Zhao’an facility were722.0 kg N hm^-2,410.8kg P₂O₅ hm^-2 and 1065.9 kg K₂O hm^-2.The sweet pepper planting soils in the facility are generally acidic,and the nutrient content in the surface layer（0-20 cm）is higher than that in the lower layer（20-40 cm）.The soil nutrients are relatively deficient in organic matter and available magnesium,and the rest are rich.There are differences in environmental effects among different farmers.With the management measures of high-yield farmers,Zhao’an County can increase 19.5%of the output,reduce 17.5%of the loss of active nitrogen,18.1%of the greenhouse gas effect,17.6%of the acidification effect and 17.4%of the eutrophication effect.（2）Compared with FFP treatment,OPT treatment does not affect nutrient accumulation,dry matter accumulation,yield,and economic benefits of sweet peppers in facilities,but it helps to improve fertilizer utilization and reduce nutrient surplus.From an environmental cost perspective,losses of active nitrogen,greenhouse gas effects,acidification effects,and eutrophication effects all significantly decreased.Compared with FFP treatment,OPT+Mg treatment significantly increased leaf nitrogen accumulation,dry matter accumulation,commercial fruit yield,economic benefits,and fertilizer utilization rate,and leaf potassium accumulation and nutrient surplus were significantly reduced.From the perspective of environmental costs,the unit yield loss of active nitrogen,greenhouse gas effect,acidification effect,and eutrophication effect also decreased significantly,and the decline was larger than that of OPT treatment.（3）Soil magnesium fertilizer application helps plant dry matter accumulation,and in addition to stem,dry matter accumulation of roots,leaves,and fruits has significantly improved;Compared with the non-magnesium application,the increase in the amount of magnesium fertilizer of 30-60 kg Mg hm^-2 has the most significant effect.Soil magnesium spraying significantly increased the absorption and utilization of leaf nitrogen and inhibited the absorption and utilization of potassium in leaves,but did not affect the absorption and utilization of phosphorus in leaves.The application of magnesium fertilizer in the soil can increase the total yield and superior fruit rate of sweet peppers in the facility,thereby increasing the commercial fruit output and economic benefits.The application of magnesium fertilizer at 30-60 kg Mg hm^-2 increases the production and economic benefits most significantly.The application of magnesium fertilizer significantly increased the partial productivity of nitrogen,phosphorus,and potassium fertilizers in sweet peppers at the facility.When the magnesium application amount was 30 kg Mg hm^-2,the partial productivity of fertilizer was the highest.（4）The dry matter accumulation of sweet pepper（especially for fruits）was increased with foliar Mg（Mg SO₄·7H₂O）concentration increased.The4%Mg concentration was significant differences with control treatment（0%）.The absorption and utilization of Mg and nitrogen（N）in leaves were significantly increased,while that the leaf potassium（K）concentration was significantly decreased when foliar Mg application increased.However,the leaf phosphorus（P）concentration was not significantly affected by foliar Mg application.The fertilizer utilization rate,yield and the economic benefits of sweet pepper increased with foliar Mg application increased.The highest effect was observed at 4%foliar Mg application for all parameters.