Showing papers by "Potsdam Institute for Climate Impact Research published in 1986"
TL;DR: The application of soil analysis of inorganic nitrogen (nitrate and ammonium nitrogen which are readily available to plants) for deriving optimum fertilization of winter cereals, sugar beet and malting barley in the German Democratic Republic is reviewed.
6 citations
01 Oct 1986
TL;DR: In this article, the effects of various types of phosphorus fertilizers on yields, phosphorus uptake and fertilizer conversion in the soil were investigated, and the optimum effects were obtained from water-soluble phosphate, whereas finely ground soft rock phosphate had little effect.
Abstract: Long-term experiments have been undertaken to investigate the effects of various types of phosphorus fertilizers on yields, phosphorus uptake and fertilizer conversion in the soil Optimum effects were obtained from water-soluble phosphate, whereas finely ground soft rock phosphate had little effect even with large amounts of phosphorus fertilizers and with a pH value of the soil of around 54 Partially decomposed and sintered phosphates performed well, as did NPK fertilizers (100% water soluble) and Thomas phosphate The addition of large amounts of phosphorus fertilizers (to cereals, 264 kg/ha, to other crops 44 kg/ha) led to yields being increased by 7% and phosphorus extraction being increased by 11% Smaller amounts of phosphorus fertilizers (132 and 176 kg/ha) did not have this effect Increases in the amount of double-lactate-soluble phosphorus in the soil depended on the level of fertilization and did not differ significantly according to the type of phosphorus fertilizer used
4 citations