不同用量腐植酸复合肥在辣椒上的施用效应及其防衰增产机理研究

以辣椒为供试作物进行盆栽试验，对不同用量腐植酸复合肥在辣椒上的施用效应及其防衰增产机理进行研究。结果表明，不同肥料用量对辣椒体内各种生理活动均有明显影响，并最终影响产量，且与无机复合肥相比，腐植酸复合肥表现了明显的优势。NRA随施肥量的增加而提高，但变化速率逐渐下降；SOD活性在施肥量低于0．2g·kg^-1时，随施肥量的增加显著提高，但当施肥量超过0．2g·kg^-1后，SOD活性开始显著降低；对POD活性的影响与对NR活性的影响趋势基本一致，但当施肥量超过0．3g·kg^-1时，无机肥处理的POD活性显著提高，而HA复合肥处理的POD活性变化则始终较平缓；对辣椒叶片蒸腾速率的影响与对SOD活性的影响趋势是一致的。施肥量与辣椒产量之间呈显著二次曲线相关，HA复合肥最高产量施肥量(纯养分量)为0．27g·kg^-1，每盆最高产量为165．22g。

Effects of different application rates of humic acid compound fertilizer on pepper and its mechanism of anti-senility and incremental yield

The effects of different application rates of humic acid compound fertilizer (HA) on the yield and physiological characteristics of pepper (Capsicum frutescens L.) were studied in this paper. The results showed that different application rates of (HA) could affect the physiological activities and yield of pepper. The nitrate reductase activity (NRA) and peroxidase (POD) activity were improved with increasing application rate, but the change rate of NRA was reduced gradually. POD activity in inorganic compound fertilizer treatment was improved significantly when the application rate of fertilizer was higher than 0.3 g.kg-1, but that in HA treatment changed smoothly. Superoxide dismutase (SOD) activity was improved significantly when the application rate of fertilizer was lower than 0.2 g.kg-1, and decreased gradually when the application rate was higher than 0.2 g.kg-1. The change of transpiration rate was consistent with that of SOD activity. The relationship between the application rate of fertilizer and the yield of pepper could be described with quadratic curve regression model. According to the equation, the highest application rate of HA should be 0.27 g.kg-1, and the highest yield of pepper could reach 165.22 g per pot.