Effects of Slow-Release Compound Fertilizer on Eggplant (Solanum melongena) Quality

摘要

Eggplant rutin is beneficial effect against oxidative damage of cells, moderate amount of solanine is good for the body, the anthocyanins have antioxidant functions. To investigate the effects of slow-release compound fertilizer (SRF) on compounds such as rutin, solanine, anthocyanins in eggplant (Solamun melongena L.) with a long growth period, the field experiments were conducted in neutral and slightly alkaline soils using the eggplant varieties called Heisheng and Zhuqie. Results showed that rutin content were higher with SRF treatment than with chemical fertilizer (CF) treatment at the second fruiting stage of Heisheng and Zhuqie eggplants grown in neutral and slightly alkaline soils. Furthermore, SRF increased solanine content of Zhuqie eggplant, which typically contains low levels of solanine, and decreased the solanine content of Heisheng eggplant, which typically contains high solanine levels. In the Zhuqie variety, anthocyanins levels were higher with SRF treatment than with CF and common compound fertilizer (CCF) treatments except at the second fruiting stage of eggplants grown in neutral soil. To sum up, slow-release compound fertilizer with one-time application could slowly supply nutrients to satisfied eggplant need, which will not only reduce labour costs but also improve eggplant qualities.