Forms of inorganic phosphorus in soil under different long term soil tillage systems and winter crops

The cultivation of crops with different capacity of P uptake and use under long-term soil tillage systems can affect the distribution of P cycling and inorganic forms in the soil, as a result of higher or lower use efficiency of P applied in fertilizers. The purpose of this study was to evaluate the effect of long-term cultivation of different winter species under tillage systems on the distribution of inorganic P forms in the soil. In 1986, the experiment was initiated with six winter crops (blue lupin, hairy vetch, oat, oilseed radish, wheat and fallow) on a Rhodic Hapludox in southwestern Paraná, under no-tillage (NT) and conventional tillage (CT). The application of phosphate fertilizer in NT rows increased inorganic P in the labile and moderately labile forms, and soil disturbance in CT redistributed the applied P in the deeper layers, increasing the moderately labile P concentration in the subsurface layers. Black oat and blue lupin were the most efficient P-recyclers and under NT, they increased the labile P content in the soil surface layers.

Immunization Update, Winter 2011

Monthly newsletter for the Iowa Department of Public Health

Iowa EHDI News, Winter 2008

Program newsletter used to communicate with parents and professionals about newborn hearing screening in Iowa, including best practice and family stories.

Iowa EHDI News, Winter 2009

Program newsletter used to communicate with parents and professionals about newborn hearing screening in Iowa, including best practice and family stories.

Iowa EHDI News, Winter 2010

Program newsletter used to communicate with parents and professionals about newborn hearing screening in Iowa, including best practice and family stories.

Targeted Small Business Link, Winter 2011

Targeted small business news from the Iowa Economic Development Authority's Targeted Small Business Program

[Illustrations de Les vendanges!] / Henry de Groux, dess. ; Léon Bloy, aut. du texte

Comprend : [Page de titre : une Chimère.] Chimera bombicinans in deserto. Rabelais. [Cote : Res Atlas Z 18/Microfilm R 122330] ; [Pl.1 :] 8. La Vigne abandonnée. [Cote : Res Atlas Z 18/Microfilm R 122330] ; [Pl.2 : visage hurlant.] [Cote : Res Atlas Z 18/Microfilm R 122330]