缺素对压砂西瓜产量、品质及叶绿素含量的影响

以压砂西瓜为材料,通过田间小区试验,研究营养液施用对西瓜产量、品质及叶绿素含量的影响。结果表明院氮、磷、钾全量营养液增产率达34.2%,西瓜糖度提高1.84个百分点,同时增强抗病性;缺钾营养液虽然也有16.7%的增产率,但糖度降低0.40个百分点。利用便携式SPAD-502叶绿素仪进行压砂西瓜营养诊断,简单易行,伸蔓期SPAD值应控制在54～56,如果此期SPAD值低于该范围,则在坐果期适当加大营养液的施用量,SPAD值高于该范围,则适当减少营养液的施用量;坐果期SPAD值应控制在57～59,此期的营养诊断方法参照伸蔓期;果实生长盛期SPAD值应控制在58～60。

Effect of Deficiency Nutriment Elements on Sand Watermelon Yield,Quality and Chlorophyll Content on Gravel-mulched Land

A field experiment was conducted to study the effect of deficiency nutriment elements on watermelon yield , quality and chlorophyll content. The results showed that the yield under whole amount of nitrogen , phosphorus and potassium nutrient solution increased 34.2% , the watermelon sugar content increased by 1.84 percentage points , while enhancing disease resistance. Yield under potassium nutrient deficiency treatment increased 16.7% , but the sugar content reduced by 0.40 percentage points. Portable SPAD-502 chlorophyll meter could simply diagnose pressure sand watermelon nutrition. At extensor vine stage , the SPAD value should be controlled from 54 to 56 , this period SPAD value was lower than the range , so that at fruit set stage we should increase the nutrient solution application rate. If the SPAD value was higher than the range , we should reduce the nutrient solution application rate. SPAD value of fruit set stage should be controlled from 57 to 59 , nutrition diagnosis method could refer to vine growth stage. At fruit growing stage , the SPAD value should be controlled from 58 to 60.