重庆市不同地貌甘薯土壤养分丰缺指标及施肥方案

为了解重庆市不同地貌甘薯种植区土壤肥力差异,对2007~2010年重庆市甘薯"3414"试验结果进行分析,并根据测土配方施肥技术规范建立各地貌甘薯种植区土壤养分丰缺指标,利用肥料效应函数法确定各地貌甘薯种植区推荐施肥量。结果表明,山地甘薯种植区土壤肥力高于丘陵甘薯种植区,将丘陵甘薯种植区土壤碱解氮分为5个等级(62、62~83、83~112、112~152、152 mg/kg),对应的氮肥推荐施用量为137.4、109.35~137.4、81.3~109.35、53.1~81.3、53.1 kg/hm~2,将土壤有效磷分为3个等级(6.3、6.3~16.7、16.7 mg/kg),对应的磷肥推荐施用量为64.2、50.25~64.2、50.25 kg/hm~2,将土壤速效钾分为4个等级(49、49~73、73~110、110 mg/kg),对应的钾肥推荐施用量为128.1、99~128.1、70.05~99、70.05kg/hm~2;将山地甘薯种植区土壤碱解氮分为4个等级(55、55~82、82~122、122 mg/kg),对应的氮肥推荐施用量为162.15、123.75~162.15、85.2~123.75、85.2 kg/hm~2,将土壤有效磷分为4个等级(3.4、3.4~9.3、9.3~25.9、25.9 mg/kg),对应的磷肥推荐施用量为87.75、73.95~87.75、60.3~73.95、60.3 kg/hm~2,将土壤速效钾分为5个等级(53、53~77、77~114、114~169、169 mg/kg),对应的钾肥推荐施用量为151.5、126.3~151.5、101.1~126.3、75.9~101.1、75.9 kg/hm~2。

The soil fertility and fertilization strategies of sweet potato in different landforms areas of Chongqing

Records of "3414" field trial for sweet potato during 2007 to 2010 were collected and analyzed for investigating the difference in soil fertility, establishing soil nutrient plentiful-lack index, and determining optimum fertilizer rate for sweet potato planting areas with different landforms of Chongqing. The results showed that the soil fertility in mountainous ar-eas was higher than that in hilly regions. Based on the outcomes of the simulation model, the fertilizer recommended rates were obtained for sweet potato planting areas with different landforms. For hilly regions, the recommended N fertilizer rates were>137. 4, 109. 35~137. 4, 81. 3~109. 35, 53. 1~81. 3, <53. 1 kg/hm2 , when the soil available nitrogen content was<62, 62~83, 83~112, 112~152, >152 mg/kg, respectively. The recommended P fertilizer rates were>64. 2, 50. 25~64. 2, <50. 25 kg/hm2 , when soil available phosphorus content was<6. 3, 6. 3~16. 7, >16. 7 mg/kg, respec-tively. The recommended K fertilizer rates were>128. 1, 99~128. 1, 70. 05~99, <70. 05 kg/hm2 , when soil available potassium content was<49, 49~73, 73~110, >110 mg/kg, respectively. For mountainous areas, the recommended N fertilizer rates were>162. 15, 123. 75 ~162. 15, 85. 2 ~123. 75, <85. 2 kg/hm2 , when soil available nitrogen content was<55, 55~82, 82~122, >122 mg/kg, respectively. The recommended P fertilizer rates were>87. 75, 73. 95 ~87. 75, 60. 3~73. 95, <60. 3 kg/hm2 , when soil available phosphorus content was<3. 4, 3. 4~9. 3, 9. 3~25. 9, >25. 9 mg/kg, respectively. The recommended K fertilizer rates were >151. 5, 126. 3 ~151. 5, 101. 1 ~126. 3, 75. 9 ~101. 1, <75. 9 kg/hm2 ,when soil available potassium content was<53, 53~77, 77~114, 114~169, >169 mg/kg, respectively.