粤北山区柰李测土配方施肥技术指标体系研究

在不同地点、不同肥力的果园,设置柰李肥料试验,对施肥量、土壤有效养分含量(碱解氮、有效磷、速效钾)和柰李相对产量等试验数据进行相关统计分析,并求取相应的回归方程,建立合适的数学模型,以此初步建立粤北山区柰李土壤有效养分丰缺指标和不同肥力土壤的推荐施肥量指标。结果表明:柰李的碱解氮、有效磷、速效钾丰缺指标的数学模型分别为:y(相对产量)=37.334 ln(x)-89.905(R2=0.549 2,n=15)、y(相对产量)=11.149 ln(x)+37.141(R2=0.915 7,n=15)、y(相对产量)=32.779 ln(x)-65.621(R2=0.902,n=15)。柰李的推荐施氮、磷、钾肥总量数学模型分别为:y=-18.763 ln(x)+98.391(R2=0.669 9,n=15)、y=-2.611 2 ln(x)+16.07(R2=0.767 1,n=15)、y=-15.601 ln(x)+83.701(R2=0.750 9,n=15)。并根据推荐施肥量数学模型计算出粤北山区柰李不同土壤有效养分含量的推荐施肥总量。当土壤碱解氮含量分别为:<42.41、42.41~82.84、82.84~114.56、>114.56 mg/kg时,推荐的总施氮量分别为:>28.08、15.52~28.08、9.43~15.52、<9.43 kg/667 m2;当土壤有效磷含量为:<3.17、3.17~29.84、29.84~179.40、>179.40 mg/kg时,推荐的总施磷量分别为:>13.06、7.21~13.06、2.52~7.21、<2.52 kg/667 m2;当土壤速效钾含量分别为:<34.03、34.03~72.96、72.96~134.30、>134.30 mg/kg时,推荐的总施钾量分别为:>28.67、16.77~28.67、7.25~16.77、<7.25 kg/667 m2。

Study on Techno-Index System of Soil Testing and Formulated Fertilization on Nai-plum in Mountainous Area of Northern Guangdong Province

The nai-plum fertilization tests were set in the orchard fields of different fertility levels and different locations.The test date of the rate of fertilizer application amounts(N,P2O5,K2O),the soil available nutrient of nitrogen,phosphorus and potassium,the relative yield of nai-plum were analyzed statistically,and the regression equations were also acquired.The proper mathematical models based on regression equations,and the richness or deficient status index by recommended about the soil available nutrient content and the total doses of fertilizer for nai-plum in mountainous area of Northern Guangdong Province were obtainted.Results showed that the regressions equation index for alkali-hydrolysable nitrogen,available phosphorus and available potassium were as follows:y(relative yield)=37.334 ln(x)-89.905(R2=0.549 2,n=15),y(relative yield)=11.149 ln(x)+37.141(R2=0.915 7, n=15),y(relative yield)=32.779 ln(x)-65.621(R2=0.902,n=15).The regression equations of the total doses of nitrogen(N),phosphorus(P2O5)and potassium(K2O)for nai-plum were as follow:y=-18.763 ln(x)+98.391(R2=0.669 9,n=15),y=-2.611 2 ln(x)+16.07(R2=0.767 1,n=15),y=-15.601 ln(x)+83.701(R2=0.750 9,n=15).The total doses of nitrogen(N)were as follow: >28.08 kg/667 m2,15.52 kg/667 m2to 28.08 kg/667m2,9.43 kg/667 m2 to 15.52 kg/667 m2,<9.43 kg/667 m2,when alkali-hydrolysable nitrogen in the soil were :<42.41 mg/kg,42.41 mg/kg to 82.84 mg/kg,82.84 mg/kg to 114.56 mg/kg,>114.56 mg/kg;the total doses of phosphorus(P2O5)were as follow:>13.06 kg/667 m2,7.21 kg/667 m2to 13.06 kg/667 m2,2.52 kg/667 m2 to 7.21 kg/667 m2,<2.52 kg/667 m2,when available phosphorus in the soil were:<3.17 mg/kg,3.17 mg/kg to 29.84 mg/kg,29.84 mg/kg to 179.40 mg/kg, >179.40 mg/kg;the total doses of potassium(K2O)were as follow:>28.67 kg/667 m2,16.77 kg/667 m2to 28.67 kg/667 m2,7.25 kg/667 m2to 16.77 kg/667 m2,<7.25 kg/667 m2,when available potassium in the soil were :<34.03 mg/kg,34.03 mg/kg to 72.96 mg/kg,72.96 mg/kg to 134.30 mg/kg, >134.30 mg/kg.