钾肥用量对温室番茄产量及品质的影响

Influence of potassium fertilizer application on the yield and quality of greenhouse tomato

为了探究对春温室番茄产量品质最适宜的钾肥用量(以K_2O计),试验设5个K_2O用量水平,分别是0、9、13.5、18、22.5 kg·667 m^(-2)。通过试验得出,K_2O用量为13.5和18 kg·667 m^(-2)的处理分别在株高和茎粗上变现最优;667 m^2施18 kg的K_2O产量最高,为8 284.73 kg,4个施钾肥处理均与对照呈显著差异,通过回归分析,得出667 m^2施18.52 kg时产量达到最大;品质方面,18 kg·667 m^(-2)的处理在维生素C和可溶性固形物含量上的表现最好,13.5和18 kg·667 m^(-2)的处理在果实硝酸盐含量上均表现较低,与其他3个处理呈显著差异。因此,667 m^2施K_2O在13.5～18.52 kg时,对滴灌条件下春温室番茄的产量提升和品质改善有明显的促进作用。

In order to find out the optimum dosage of potassium fertilizer on tomato in spring greenhouse, 5 dosages of K2O levels which were 0, 9, 13.5, 18, 22.5 kg per 667 m^2 respectively were used in this research. The results showed that, there were significantly differences between the treated plants and the control ones. The treatments of 13.5 kg and 18 kg K2O per 667 m^2 showed the best effect on plant height and stem diameter, the plants treated by 18 kg K2O per 667 m^2 exhibited the highest yield which was 8 284.73 kg. Through regression analysis, when treated by 18.52 kg K2O per 667 m^2 the tomato showed the maximum yield. 18 kg K2O per 667 m^2 treatment was found the highest vitamin C and soluble solids contents, the lowed nitrate content of the fruit was discovered under the treatments of 13.5 and 18 kg per 667 m^2, which showed significantly difference with the other three treatments. Therefore, the tomato yield and quality will be improved when the K2O application on 667 m^2 was between 13.5 and 18.52 kg under drip irrigation condition in spring greenhouse cultivation.