Characteristics and origin of paddy soil nutrient and corresponding fertilizing strategy at different altitudes in Minhou County
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摘要: 对闽侯县不同海拔水稻土进行取样分析，结果表明：水稻土有机质、碱解氮、有效磷养分含量总体较高，但分布不均， 82.1%的土样速效钾处于中低水平；低、中、高海拔区的有机质、碱解氮呈随海拔上升而增加的趋势；有效磷、速效钾均表现为低海拔区 >高海拔区 >中海拔区； pH值表现为随海拔增加而降低的趋势。建议低海拔区应降低磷肥施用量、稳步提升有机质含量；中海拔区应适当补磷、增钾；高海拔区应适当调减氮肥用量，酸性稻田应注意补充石灰、白云粉等以提高土壤pH值。Abstract: Paddy soils at different altitudes of Minhou County were sampled and analyzed. The results showed that the contents of organic matter, alkali-hydrolyzable N, and available P were generally high but not even; Available potassium contents in 82.1% samples were at medium or low level, and the contents of organic matter and alkali-hydrolyzable N increased following with the rising of altitude; Meanwhile, contents of both available P and available potassium at different altitudes showed the trends that low altitude >the high >the middle. The pH value decreased as the altitude. It is suggested that the dose of P fertilizer should be decreased and the organic matter contents should be increased in the low-altitude area; K and P fertilizer should be suitably added in the middle-altitude area; and the N fertilizer should be reduced in the high-altitude area. Moreover, lime and dolomite could be applied in the acid paddy soil to increase the pH value.
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Keywords:
- Minhou County /
- paddy soil /
- altitude /
- soil nutrients /
- fertilizing strategy
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