The desorption rate from vegetable soils is higher than the desorption rate from natural soils, because of high initial soil P in those soils. In summary, large amounts of P are accumulated in most cultivated calcareous soils from fertilizer application. No P fertilizer application is necessary for calcareous soils with high available P levels. Growers should conduct a pre-fertilizer soil analysis to determine supplemental P fertilizer rates. Researchers say cover crops are planted to improve soil quality, enhance nitrogen management, provide erosion control, and suppress weeds, insects, and nematodes.
Cover crops can enhance nitrogen production and can also reduce nutrient losses.
Grass can be used to take up excess nitrogen and help alleviate groundwater leaching. Cover crops can be used to reduce wind and water erosion. Maintaining ground covers through fall, winter, and early spring drastically reduces soil loss. Soil texture affects both nutrient availability and water management. It also affects how much herbicide the soil will hold.