Paddy Soil Fertility and Effects of NPK Fertilization on Middle-season Rice in Minqing County
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摘要: 为掌握闽清县水稻田土壤养分状况, 采集并检测4 005个水田土壤样本的土壤养分含量, 并与第2次土壤普查结果进行比较, 同时通过2007-2012年实施的中稻3414田间肥效试验结果分析, 比较NPK施肥效应。结果表明:闽清县水田土壤有机质、有效磷含量以丰富和中等为主, 中等含量以上分别占88.44%、75.21%, 碱解氮含量以中等为主, 占86.04%, 速效钾以缺乏为主, 占83.50%;交换性钙、有效硫、有效锌以中等以上含量为主, 交换性镁、有效硼以缺乏为主。同第2次土壤普查相比, 酸性土壤比重进一步加大, 而有机质、速效养分含量均呈上升趋势。NPK肥对中稻产量贡献率分别为20.5%、3.6%与6.5%, 有别于20世纪80年代的水稻增产效应:N>P>K。针对闽清县水田肥力状况, 中稻应适量施用石灰调节pH值, 增施氮、钾肥, 酌施磷肥和中微量元素, 并多施有机肥。Abstract: 4005paddy soils in Minqing county was used to assay the fertility, and which was compared with the second general soil survey, then the effect of NPK fertilization on middle-season rice was character by 3414 experiments from 2007 to 2012.The results showed that organic matter and available phosphorus accounte for88.44% and 75.21%, respectively.Available nitrogen and potassium accounted for 86.04% and 83.50%.Available calcium, sulfur and zinc were above middle, but the available magnesium and boron were scared.Compared with the results of second general soil survey, the proportion of acid soil increased and the organic matter and available nutrient content increased.The effect of NPK on middle-season rice were 20.5%、3.6% and 6.5%respectively, but it is different from results in the 1980s (N>P>K) .Our results suggest that lime will be used to adjust pH, organic fertilizer、nitrogen and potassium will be used to increased fertilizer, and phosphorus and medium trace element also will be used in middle-season rice in Minqing County.
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Key words:
- paddy field /
- soil fertility /
- middle-season rice /
- fertilization effect /
- 3414experiment
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