This paper tried to provide the optimal fertilization for pear orchards in China. Based on the Modern Agro-industry Technology Research System, the species of applied manure and fertilizer, fertilization time, fertilization dosage and fertilization patterns in the 744 pear orchards distributed in 18 general stations over China were investigated. The results showed that manures of pig, cattle and sheep were mainly applied in pear orchards, while commercial organic fertilizer was merely or hardly used. Urea and NPK compound fertilizer were the main chemical fertilizers adopted by pear growers. The ratio of N:P:K in the compound fertilizer was not standardized, and high phosphorus or potassium ratio was often observed. Chemical fertilizer was normally applied as the part of base fertilizer and mostly as top dressing in the fruit expansion, while great difference of the top dressing was observed before germination and differentiation of flower bud. There was great difference in the manure dosage either as per acre or per plant. The use of manure was insufficient in the most of pear orchards. It was observed that no manure was applied in 30% orchards in 5 stations. The chemical fertilizer dosage was also fluctuated in a large range, which suggested that blind fertilization was serious. Hole or strip application was the main pattern in orchard fertilization but the depth of fertilization was greatly different.
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董彩霞,姜海波,赵静文,徐阳春.我国主要梨园施肥现状分析[J].土壤,2012,44(5):754-761. DONG Cai-xia, JIANG Hai-bo, ZHAO Jing-wen, XU Yang-chun. Current fertilization in pear orchards in China[J]. Soils,2012,44(5):754-761