[Rhizosphere effect of nutrients in different maize soils with different fertility levels].
Maize plants and soil samples were collected from Jilin Province to study the nutrient dynamics in soil-maize plant rhizosphere and their relationship with plant uptake. The results showed that NH4(+)-N and NO3(-)-N were accumulated in rhizospheric soil, and mainly controlled by the application of chemical fertilizers. Soil available P was depleted in high fertility fields, especially in high seedling density, while accumulated in low fertility fields. Soil available K was accumulated in rhizospheric soil, and its accumulation rate was higher in high fertility than in low fertility fields. The nutrient absorption amount was N approximately K > P for maize plant shoots and roots, but was N > K > P for seeds. The contribution rate of chemical fertilizers to maize yield was only 1/5-1/3 in Jilin Province, and the rest was contributed by the application of organic manure, such as chicken feces or cow feces, and by the mineralization of soil organic matter.
Wu
L
L
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015. lhwu@issas.ac.cn
Zhang
S
S
D018533:Biomass; D017753:Ecosystem; D005308:Fertilizers; D017672:Nitrogen Compounds / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D012987:Soil; D003313:Zea mays / Q000254:growth & development
D005308:Fertilizers; D017672:Nitrogen Compounds; D012987:Soil; D010758:Phosphorus; D011188:Potassium