In recent years, many researchers at home and abroad have conducted research on the spatial variability of soil nutrients. Applying a soil tester to study the spatially changing soil available phosphorus and nitric acid, provided an important basis for the use of farmland nitrogen and phosphorus fertilizers, studied the spatial variation of farmland soil nutrients, and pointed out that potential surface soil reduction application of nitrogen and organic matter variation is normal The distribution and soil tester can accurately predict the spatial distribution of farmland soil nutrients in the purple soil area. Accurate and convenient prediction is of great significance to promote the sustainable development of modern agriculture.
The soil tester uses the topographic map of the study area and the land use status map as auxiliary information for indoor distribution, and the sampling points are placed in plough patches (paddy fields and dry lands) according to the principle of uniformity. At the same time, the influence of topography on soil nutrient variation is taken into account. , Different terrain parts and different slope orientations were arranged correspondingly, and altogether 450 samples were arranged. After the sample was brought back to the laboratory, it was naturally air-dried, ground through a 1mm sieve, and the soil tester was set aside.
From the correlation analysis between topographic factors and soil nutrients, it can be found from the soil tester values ​​that soil organic matter content is extremely significantly positively correlated, and is often in a state of standing water. Therefore, organic matter is decomposed slowly and is easy to accumulate, and the slope is large. In areas with large curvature, soil is easily lost, so the organic matter content is low. In addition, the soil water content at different distances from the valley is different, and the different slope directions lead to the different light radiation received, which affects the decomposition rate and content of organic matter. This is basically consistent with the results of some foreign studies.
Soil phosphorus (except for artificial fertilization) mainly comes from the slower weathering of parent rock and parent rock, and the distribution of phosphorus in the soil by human disturbance. Phosphorus is easily fixed in soil and its mobility is very weak. Therefore, the soil phosphorus measured by the soil tester is affected by the topographic factors. Potassium topography is relatively weak, and the relationship between farmland without potash fertilizer is mainly due to the research field. Potassium is also mainly derived from rocks in soil, and the release rate of weathered potassium from rocks is too slow.
The soil tester uses the topographic map of the study area and the land use status map as auxiliary information for indoor distribution, and the sampling points are placed in plough patches (paddy fields and dry lands) according to the principle of uniformity. At the same time, the influence of topography on soil nutrient variation is taken into account. , Different terrain parts and different slope orientations were arranged correspondingly, and altogether 450 samples were arranged. After the sample was brought back to the laboratory, it was naturally air-dried, ground through a 1mm sieve, and the soil tester was set aside.
From the correlation analysis between topographic factors and soil nutrients, it can be found from the soil tester values ​​that soil organic matter content is extremely significantly positively correlated, and is often in a state of standing water. Therefore, organic matter is decomposed slowly and is easy to accumulate, and the slope is large. In areas with large curvature, soil is easily lost, so the organic matter content is low. In addition, the soil water content at different distances from the valley is different, and the different slope directions lead to the different light radiation received, which affects the decomposition rate and content of organic matter. This is basically consistent with the results of some foreign studies.
Soil phosphorus (except for artificial fertilization) mainly comes from the slower weathering of parent rock and parent rock, and the distribution of phosphorus in the soil by human disturbance. Phosphorus is easily fixed in soil and its mobility is very weak. Therefore, the soil phosphorus measured by the soil tester is affected by the topographic factors. Potassium topography is relatively weak, and the relationship between farmland without potash fertilizer is mainly due to the research field. Potassium is also mainly derived from rocks in soil, and the release rate of weathered potassium from rocks is too slow.