Unreasonable fertilization will lead to imbalance of soil nutrients, which will restrict the growth and development of orchard fruit trees, and will also affect the fruit, yield and other issues. Any shortage or excess of any nutrient element in the soil will affect the growth of fruit trees and even lead to death. The decline in orchard soil quality over the years has become a threat to fruit production. The nutrient status of the soil and its spatial distribution in each soil layer of the pomegranate orchard in Mengzi, Yunnan Province were analyzed. The purpose was to clarify the nutrient status and spatial distribution of the soil in the garnet orchard soil of the county, and to provide references for further promoting the nutrient management of the orchard soil. Soil nutrients were measured using a soil nutrient tester.
The six plots with the same soil texture and fertility habits were sampled. Three pomegranate trees were randomly selected in each plot. The distance along the diagonal line of each pomegranate tree was vertical. The horizontal direction was centered on the base of the trunk and each outward 50. For one sampling segment, the soil is divided into spit sections; the vertical direction is down from the surface of every 20. It is a sampling section and is divided into soil for spit extraction. Among them, the horizontal direction is only 50 and 100 au. A 20, 20} X10Qu soil samples. Twelve soil samples were taken from each tree and the soil samples were discarded by quartering until the remaining soil sample was approximately 1 kg. The soil samples were brought back to the laboratory for air drying, grinding and sieving before being used. The determination items of the measurement indexes include soil pH value, organic matter, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium content. The soil nutrient content is determined by conventional methods, so the instrument is a soil nutrient tester. In the study area, soil nutrients in the pomegranate orchard were lower in content of alkali-hydrolyzed nitrogen, and the content of soil organic matter, available phosphorus and available potassium were more abundant. This may be related to the local management of fertilization and the characteristics of phosphorus in the soil. The low alkaline nitrogen content of the soil in the study area may become a limiting factor for the production of pomegranate. Therefore, nitrogen fertilizer should be added appropriately to control phosphorus and potassium fertilizers.
The nutrient content of soil samples was measured by soil nutrient tester. It can be found that the soil of Yunnan Mengzi Pomegranate Garden provides good nutritional conditions for the production of high-quality pomegranate. At the same time, the growth of fruit trees on the soil requires different types of mineral nutrient elements and absorption ratios in the soil, which causes excessive accumulation or depletion of certain nutrient elements in the soil, resulting in imbalanced nutrient ratios, which may adversely affect the growth of fruit trees. Ultimately, the yield of fruit is reduced and the quality is deteriorated. The large accumulation of phosphorus and potassium nutrients in orchard soils is mainly caused by the blind application of large quantities of N, P and K fertilizers in production. Appropriately reducing the amount of chemical fertilizers, increasing the content of trace elements in the soil and balancing the ratios of large, medium and trace elements in the soil by increasing organic fertilizers is one of the important measures to improve the quality of the pomegranate orchard soil and the yield and quality of the fertilizer.
The six plots with the same soil texture and fertility habits were sampled. Three pomegranate trees were randomly selected in each plot. The distance along the diagonal line of each pomegranate tree was vertical. The horizontal direction was centered on the base of the trunk and each outward 50. For one sampling segment, the soil is divided into spit sections; the vertical direction is down from the surface of every 20. It is a sampling section and is divided into soil for spit extraction. Among them, the horizontal direction is only 50 and 100 au. A 20, 20} X10Qu soil samples. Twelve soil samples were taken from each tree and the soil samples were discarded by quartering until the remaining soil sample was approximately 1 kg. The soil samples were brought back to the laboratory for air drying, grinding and sieving before being used. The determination items of the measurement indexes include soil pH value, organic matter, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium content. The soil nutrient content is determined by conventional methods, so the instrument is a soil nutrient tester. In the study area, soil nutrients in the pomegranate orchard were lower in content of alkali-hydrolyzed nitrogen, and the content of soil organic matter, available phosphorus and available potassium were more abundant. This may be related to the local management of fertilization and the characteristics of phosphorus in the soil. The low alkaline nitrogen content of the soil in the study area may become a limiting factor for the production of pomegranate. Therefore, nitrogen fertilizer should be added appropriately to control phosphorus and potassium fertilizers.
The nutrient content of soil samples was measured by soil nutrient tester. It can be found that the soil of Yunnan Mengzi Pomegranate Garden provides good nutritional conditions for the production of high-quality pomegranate. At the same time, the growth of fruit trees on the soil requires different types of mineral nutrient elements and absorption ratios in the soil, which causes excessive accumulation or depletion of certain nutrient elements in the soil, resulting in imbalanced nutrient ratios, which may adversely affect the growth of fruit trees. Ultimately, the yield of fruit is reduced and the quality is deteriorated. The large accumulation of phosphorus and potassium nutrients in orchard soils is mainly caused by the blind application of large quantities of N, P and K fertilizers in production. Appropriately reducing the amount of chemical fertilizers, increasing the content of trace elements in the soil and balancing the ratios of large, medium and trace elements in the soil by increasing organic fertilizers is one of the important measures to improve the quality of the pomegranate orchard soil and the yield and quality of the fertilizer.
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