水稻专用BB肥研究

根据化肥长期定位试验和全省化肥试验网的结果，广东省多数稻田施用氮磷钾营养元素的水稻增产效应为: Ｎ＞ Ｋ＞ Ｐ。大部分水稻土有效磷含量丰富或极丰富，施磷一般对当季水稻增产效果差甚至不显效。然而，连续数季植稻不施磷则导致氮钾施肥的增产效果下降而出现减产。综合养分不同丰缺类型水稻土的肥料效应和土壤养分平衡状况，通过肥料效应的回归分析，建立施肥量与产量之间的函数关系，确定广东省水稻专用BB肥营养配方及其产品的施用技术。经田间重复示范验证，本专用 Ｂ Ｂ 肥较之各地常规施肥和等实物量进口复合肥(15－15－15) 有明显的增产效果，并可节约肥料资源，降低施肥成本。

STUDY ON RICE-SPECIFIC BULK BLENDING FERTILIZERS

Results of long-term trials and experimental network over various areas of Guangdong Province showed that the significance of yield increasing effects for rice were generally N>K>P. Application of P did not result in significant or even no increasing effect at the first crop for a large number of paddy soils, due to relative high concentrations of soil available P. However, yield increasing effects of added N and K became less significance thus resulting in yield decrease for treatments without P application after several crops. On the basis of fertilizer efficiency in various soils with different nutrient supply, nutrient balance of the soil, and the function of yield and fertilizer rates, nutrient formula and application techniques of the product were established for rice-specific bulk blending fertilizer (BBF,N∶P₂O₅∶K₂O=1∶0.35∶0.75～0.85) in Guangdong Province. After repeating field demonstrations in comparison with local fertilizer management and the same rates of imported compound fertilizers(15-15-15), it has been comfirmed that the BBF significantly increased yield, reduced fertilization costs, and saved fertilizer resources.