A field experiment has been undertaken to assay the effect of Triflurotox 250 EC applied in the rates of 0, 1.5, 3.0, 4.5, 6.9, 9.0 and 12.0 mm3 kg-1 soil on the growth and development of spring rape and white mustard and on the biochemical characteristics of the soil. The trials were conducted on leached brown soil formed from light clay silty sand of pH equal to 5.8 in 1 M KCl. The biochemica...

Acid soil is one of the most important limitations in agricultural production worldwide. Th e application of lime and the growth of Al-tolerant genotypes are the most commonly employed strategies for the amelioration of acidic soil constraints. Th is study evaluates the eff ect of soil acidity and liming on the growth and mineral nutrition of Al-tolerant potato cv. Tresor and Al-sensitive potat...

The effects of soil rare earth element (REE) on navel orange quality and safety in rare earth ore areas have gained great attention. This study investigated the transfer characteristics of REE from soil to navel orange pulp (Citrus sinensis Osbeck cv. Newhall) and examined the effects of soil REE on internal fruit quality in Xinfeng County, Jiangxi province, China. Path analysis showed that soi...

The review is an attempt to specify particular features of the biological processes involved in the nitrogen cycle as they occur in the following categories of West African ecosystems : flooded rice .fields, rain-fed agroecosystems, and forests. In rice fields in Senegal the nitrogen input through blue-green algae was reported to be in the range -, of 1-30 kg ha-' yr-'. Figures for heterotrophi...

Amelioration of subsoil acidity using gypsum (CaS04.2Hz0) or lime (CaC03) was studied on sandy textured soils with low water holding capacity in a low rainfall environment. Field trials were established in 1989 at two sites on yellow sandplain soils to investigate whether different rates, sources and combinations of gypsum and lime application could be used to increase wheat and lupin yields. G...

The dynamic soil model SAFE was calibrated and validated in a small hardwood forest of southern Quebec as a function of its ability to reproduce current soil chemistry and similar pre-industrial soil conditions despite the difference in forest history. SAFE was relatively accurate for reproducing soil chemistry, but comparison of pre-industrial soil conditions between unburned and burned stands...

Soil acidification instead of alkalization has become a new environmental issue caused by urbanization. However, it remains unclear the characters and main contributors of this acidification. We investigated the effects of an urbanization gradient on soil acidity of Pinus massoniana forests in Pearl River Delta, South China. The soil pH of pine forests at 20-cm depth had significantly positive ...