Titlebook: Biological Processes and Soil Fertility; J. Tinsley,J. F. Darbyshire Book 1984 Martinus Nijhoff/Dr W. Junk Publishers, The Hague 1984 soil

羅盤(pán)

松緊帶

廚師

Effect of lime, phosphorus and mycorrhizal fungi on growth, nodulation and nitrogen fixation by whitnd brown earth soils in pots, clover shoot production was highest with added P when a water holding capacity of 80% was maintained, but roots from the latter had only 2.6 compared to 68 nodules per plant from the former. Further work is required to explain poor nodulation in the brown earth soils.

indignant

INERT

胰臟

Influence of plant roots on C and P metabolism in soilf .P into organic P fractions. Both root C and root influences were detectable outside the immediate root zone..These results demonstrate an intensive C turnover and P mobilization in the rhizosphere soil, including some organic P fractions, and suggest that the actual rhizosphere may be greater than is generally assumed.

偏離

PURG

Extractable N and P in relation to microbial biomass in UK acid organic soils. However, the subsequent rates of production of CO.-C and mineral-N measured during a 10-day incubation period at 25.C were low and variable, resulting in anomalously low estimates of microbial biomass. The flush of inorganic-P was more consistent and, in mor humus, generally related to biomass-C as measured by the Anderson and Domsch test.

索賠

Book 1984over from the offtake of nutrients in crops and loss of soil struc- ture. By contrast, the development of intensive cropping systems requires large inputs especially of nitrogen, together with phosphorus, sulphur and other essential elements in order to maintain the nutrient levels needed for abunda

WATER

ems to recover from the offtake of nutrients in crops and loss of soil struc- ture. By contrast, the development of intensive cropping systems requires large inputs especially of nitrogen, together with phosphorus, sulphur and other essential elements in order to maintain the nutrient levels needed