Soil properties and fertilization in vegetable greenhouse at different ages

In central Shaanxi, the soil properties and current fertilization in vegetable greenhouses at different ages were investigated and studied. The results showed that soil secondary salinization, acidification, available-potassium enrichment remarkably took place and became severe with increased greenhouse ages ;the contents of organic matter ,total nitrogen and alkali-hydrolyzable nitrogen were slightly low but the content of nitrate nitrogen was high; the contents of either the former or the latter did not regularly change with greenhouse ages; organic fertilizers were few and applied in small quantities, the rates of applied fertilizers sharply varied; partial fertilization in fertilizer kinds or quantity occurred; there existed improper fertilization structure, nutrient imbalance and poor fertilization procedures. So increasing total fertilizer amount, carrying out formulated fertilization, keeping nutritive balance, improving fertilization procedure and raising fertilizer use efficiency are put forward in the paper.