Investigation And Evaluation Of Orchard Soil Fertility In Mango Production Areas In Hainan Province

In order to understand the status of soil fertility in mango orchards in order to understand the present situation of mango orchard soil fertility, to lay the foundation for scientific and rational formulation of fertilization strategy in the main producing areas of mango in Hainan Province. In this study, from the period of 2015 to 2016, 348 soil samples collected from 0 to 20, and 20 to 40 cm soil layers in mango orchards of Lingshui,Sanya, Ledong and Dongfang mango in Hainan province,Plant samples, K, Ca, Mg, S, Fe, Mn, Cu, Zn, B in soil, leaf and fruit were studied. The nutrient status of soil nutrient, leaf and fruit mineral elements were studied. Correlation. The soil nutrient content of different orchard in main production area was evaluated by the standard of soil nutrient deficiency, and the suggestion of scientific and rational fertilization in main producing areas were put forward.1. The study found that Hainan province mango garden soil pH value was 5.51, the orchard soil was acidic, which belongs to the mango tree growth suitable pH; low orchard organic matter content decreased with soil depth, soil organic matter content of four in the following three levels accounted for the percentage of soil around: Lingshui 60%, Sanya 69% , Ledong 93%, dongfang 100%, The content of total nitrogen and available nitrogen of orchard soil was low, and the content of available potassium and available phosphorus in soil was higher than that of the third grade and below, and the variation coefficient of phosphorus content in the soil was higher than that in the third grade and above.Respectively: 0 to 20 cm soil layer is 123.07%, 20 to 40 cm soil layer is 138.32%; The content of exchangeable calcium in mango orchard was rich, the content of exchangeable magnesium was low, and the content of calcium increased with the depth of soil. The trace element content of mango garden is quite rich,with the increase of the soil layer,the effective iron, the effective copper, the effective zinc content is decreased, the effective manganese is slightly increased, the effective boron is basically unchanged; Orchard soil nutrient content and fruit mineral content relevance is strong,the fruit of manganese and soil available potassium (correlation coefficient 0.990), fruit Mn and soil nitrogen(correlation coefficient 0.995), fruit and soil available manganese zinc (correlation coefficient 0.960) and soil copper and copper fruit (correlation coefficient 0.926) was significant positive correlation, Available phosphorus in soil was negatively correlated with the contents of trace elements in fruit, and the available Fe content was negatively correlated with the amount of elements in soil, and the content of available K and N in soil was positively correlated with the contents of trace elements.2. the content of CEC and the content of soil related protein in glomus in soil: The content of CEC in orchard soil in Hainan province was affected by soil depth,The coefficient of variation of CEC content in soil of 0-20 cm and 20?40 cm two in mango orchards in Hainan province was not significant,The coefficient of variation of CEC content in 0?20 cm was higher than that of the CEC content in 20?40 cm depth. Vary around. On the whole, the content of was higher in the soil of mango orchard in Zhejiang province, The contents of glomus in orchard soils of the main producing areas were: 14.79 g kg-1(Lingshui), 17.03 g kg-1(Sanya), 12.77 kg-1(ledong), 15.72 g kg-l(dongfang); There were significant differences in the coefficient of variation of the contents of glomus in the orchard soils of the main producing areas.3. Correlation of orchard soil and leaf and fruit: The results showed that there was a certain correlation between the content of mineral elements in the leaves and the contents of soil nutrients, Most of the soil nutrient elements and fruit tree leaf nutrient elements showed different correlation. The main contents were as follows: there was a negative correlation between the total phosphorus content in the leaves of mango leaves and the trace elements in the orchard soil; Most of the orchard soil nutrients and fruit leaf total magnesium, total sulfur content showed positive correlation between total iron content of orchard soil; most nutrient elements and leaves mainly for the negative correlation between the total copper content in leaves; Total Mn content, most of orchard soil nutrient elements leaves mainly for the positive correlation between the total Zn content of orchard soil; nutrient elements and leaves mainly for the negative correlation between the total boron content of orchard soil; most nutrient elements and leaves mainly showed positive correlation. There was a strong correlation between the content of soil nutrients and the content of mineral elements in fruit, Among them, manganese and soil available potassium (correlation coefficient 0.990),Among them, manganese and soil available potassium(correlation coefficient 0.990), There was a significant positive correlation between the manganese content of fruit and the soil alkali hydrolyzable nitrogen (correlation coefficient 0.995), the manganese content of the fruit and the soil available zinc (correlation coefficient 0.960) and the copper and the copper (correlation coefficient) of the soil, There was a negative correlation between the content of available phosphorus in soil and the content of trace elements in the soil. The content of available iron in soil was negatively correlated with the content of elements in the fruit.The contents of soil organic matter and soil nitrogen (total nitrogen and available nitrogen) in Hainan mango orchard were lower than those in mango orchard, and the content of available phosphorus and available potassium were upper middle level, the available phosphorus content and available potassium content were upper level and the exchangeable magnesium content was lower , Orchard soil rich in trace elements. It is suggested that basal fertilizer should be used in the production and organic manure should be added to increase nitrogen fertilizer. Appropriate with manganese and other trace elements, can spray a small amount of foliar fertilizer supplement trace elements. In fertilization should be based on the regional balance of nutrient deficiencies balanced fertilization, reasonable dosage. There are regional differences, it is recommended to apply magnesium fertilizer, appropriate to add a small amount of trace elements, or spraying a small amount of foliar fertilizer to supplement trace elements.Should be combined with the actual situation to take measures to reduce the loss of nutrients. To optimize the agricultural non-point source pollution caused by nutrient management and reduce the loss of nutrients should be paid more attention to in the future.