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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (25): 23-30.doi: 10.11924/j.issn.1000-6850.casb2025-0262

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Regulation Mechanism of Microbial fertilizer on Nitrogen and Phosphorus Stoichiometric Characteristics in Different Organs of Hazelnut and Nut Yield

XIE Bin1(), SONG Shiqi1, WANG Bin1, MENG Fanyu1, CHENG Ying2, LI Xingpeng1, JIA Shuxia1()   

  1. 1 School of Forestry, Beihua University, Jilin 132013
    2 Jilin Provincial Forestry Information Center, Changchun 130000
  • Received:2025-04-08 Revised:2025-08-23 Online:2025-09-05 Published:2025-09-16

Abstract:

To investigate the mechanisms underlying the quality improvement and efficiency enhancement of microbial fertilizer in hazelnut orchards, we examined the content of major nutrients (N, P, K), stoichiometric characteristics of N, P in various organs of hybrid hazelnut (Corylus heterophylla× C. avellana), and nut yield under microbial fertilizer and compound fertilizer treatments. The results showed that the basal diameter and length of branches under microbial fertilizer were significantly higher than those under compound fertilizer (P<0.05). Hazelnut yield per plant (dry weight), single nut weight, and kernel weight under microbial fertilizer increased by 17.1%, 2.5%, and 2.6%, respectively (P<0.05). The average kernel diameter and cavity ratio under microbial fertilizer were also higher. Compared to compound chemical fertilizer, microbial fertilizer significantly increased the N (8.1%), P (45.9%), and K (16.1%) contents in the roots, as well as the P (33.3%) and K (15.2%) contents in leaves, P (25.3%) and K (8.1%) contents in branches, and K contents in shells (18.8%) and kernels (4.3%). However, microbial fertilizer reduced the N, P, and K contents in flower by 1.1%, 2.3%, and 8.0%, respectively, and reduced the N content in shells and kernels by 31.7% and 15.2%, respectively, along with a 6.9% decrease in kernel P content. Microbial fertilizer significantly decreased the N/P ratio in leaves, branches, and roots, altering the distribution of N and P contents between the aboveground and underground organs. The regression analysis of N and P contents in various organs (flower buds, branches, leaves, roots, kernels, and shells) showed a power function with α=0.512 and β=4.857. These results indicated that microbial fertilizer enhanced nutrient content in vegetative organs (leaves, branches, and roots) of hazelnut trees, regulated the distribution of nutrients among organs, and increased hazelnut yield.

Key words: nitrogen and phosphorus stoichiometry, potassium content, nutrient allocation, nut traits, kernel ratio, Corylus heterophylla× C. avellana