不同氮肥用量对金秋梨产量及品质的影响

摘要

The objective of the experiment was to study the effect of N level on yield and quality of Jinqiu pear and to provide the theoretical foundation for improving yield and quality of pear in the Guizhou province .A field experiment was laid out using Jinqiu pear as material with three fertili-zation levels ,N application rate of 0 .15 (deficient) ,0 .25(optimum) ,and 0 .35(excessive) kg per plant .The effect of N level on yield was very significant ,with pear yield increasing as N level in-creased .The correlation between N level and quality of pear affirmatively existed .Fruit hardness was reduced ,total sugar and Vitamin C concentration were improved with the increase of N level . However ,the effect of N level on the total acids was very marginal .The net income increased with N level increasing by analyzing economic benefit .We advocated the optimum N level as an optimal N fertilizer in the south-east of Guizhou province after considering synthetically the economic be-nefit and the potential risk of exceeding N application .%研究了0．15（低氮）、0．25（中氮）、0．35 kg/株（高氮）3个氮肥用量水平对金秋梨产量、品质的影响。结果表明，金秋梨的产量与氮肥用量间存在一定的正相关关系，氮肥用量越大，金秋梨的产量越大。随着氮肥用量增加，金秋梨硬度不断降低，总糖含量和维生素C含量逐渐增加，中、高氮处理差异不明显，但对总酸含量影响较小。通过对经济效益进行分析，发现氮肥投入量越大，净收入越多。综合考虑经济效益以及过量氮肥可能对环境带来的严重危害，推荐中氮施肥处理作为贵州黔东南地区的推荐施肥量。