摘要：

Compound fertilizer can improve the fertilizer use efficiency and tree nutrition status to ensure balanced . Taking 7 year-old chestnut trees as test material, with (NH2)2CO and KH2PO4 being mixed at the different ratios, the effects of different compound fertilizers on the characteristics as well as the and fruiting of chestnut were studied quantitatively by trunk injection method. Results showed that compound fertilizer of (NH2)2CO and KH2PO4 induced positive synergistic effects to enhance photosynthetic capacity, yield and quality of chestnut obviously. The content of was decreased by (NH2)2CO and increased by KH2PO4, but increased obviously by the compound fertilizer. The contents of N, P, K of leaf and branch rose under the four compounded treatments, among which 0.3%(NH2)2CO+0.3%KH2PO4 was the best. All fertilizer treatments could advance the photosynthetic parameters, while the compound fertilizer performed better. 0.3% (NH2)2CO + 0.3% KH2PO4 treatment significantly increased the photosynthetic rate, the maximum net , apparent quantum yield, carboxylation efficiency, instantaneous use efficiency and use efficiency. Compound fertilizer could promote the of branch in diameter and length synchronously, and increase the number of mixed buds, while (NH2)2CO only promoted the of branch in length, and did little in the number of mixed buds. The compound fertilizer did better in advancing nuts yield and quality than of N or P. The nuts yield, mass and total sugar were increased by 68.2%, 25.5% and 14.9% respectively under 0.3% (NH2)2CO+0.3%KH2PO4 treatment compared with the control.

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