论文部分内容阅读
在20℃恒温培养条件下,研究低分子量有机酸类的钠钙盐(LA)和低分子量有机酸类与混合氨基酸的钠钙盐(LAA)不同用量水平对红壤和黑土磷有效性的影响。研究表明,两种低分子量有机酸类混合物在各不同水平下均能显著提高红壤和黑土磷有效性;随着培养的进行,添加有LA、LAA的各处理对红壤和黑土中磷有效性均有明显提高。无论是LA或LAA,红壤中以半量处理对提高磷有效性作用效果更为明显,而黑土中则以LAA作用效果更好,且以常量LAA处理的效果最好,常量LA和LAA处理间差异显著。在添加磷肥的基础上,与不加有机酸物质处理(CKp)相比,添加常量LA、LAA和半量LA(0.5 LA)、LAA(0.5 LAA)处理,在红壤中磷固定率平均值分别降低10.5%、22.3%和11.3%、19.4%;在黑土中分别降低8.6%、10.6%和14.1%、11.8%。LA和LAA对降低红壤和黑土磷固定率效果显著,红壤以半量处理的效果较好,黑土则以常量LAA处理效果最好。
The effect of different dosage levels of low molecular weight organic acids such as sodium and calcium salts (LA) and low molecular weight organic acids and mixed amino acid sodium and calcium salts (LAA) on the availability of phosphorus in red soil and black soil was studied under constant temperature of 20 ℃. The results showed that the mixture of two low molecular weight organic acids could significantly improve the phosphorus availability of red and black soil at different levels. As the culture progressed, the availability of LA and LAA was significantly Significantly improved. Both LA and LAA had more obvious effect on increasing phosphorus availability in red soil, whereas LAA was more effective in black soil and LAA treatment had the best effect. The difference between LA and LAA treatments was not significant Significant. On the basis of adding phosphate fertilizer, the average phosphorus fixation rate decreased in red soil with addition of LA, LAA and half LA (0.5 LA) and LAA (0.5 LAA), respectively, compared with no CKP treatment 10.5%, 22.3% and 11.3% and 19.4% respectively; in the black soil they were reduced by 8.6%, 10.6% and 14.1% and 11.8% respectively. LA and LAA had a significant effect on reducing P fixation rate in red and black soils, while red soil had better effect in half treatment and black soil had the best LAA.