Effects of P fertilizer on female strobilus and needle N and P nutrition of Pinus massoniana clones with different fruiting abilities.

doi:10.13287/j.1001-9332.202104.004

Abstract

Abstract: In order to realize precise fertilization and high yield management of Pinus massoniana clonal seed orchard, clones with different fruiting abilities were used as the materials. Four P fertilization levels were at 0, 400, 800 and 1600 g per plant (P₀, P₄, P₈ and P₁₆ respectively). Fertilization was applied before floral primordia formation and after cone picked, respectively. The effects of P fertilizer on the female strobilus of P. massoniana clones and the changes of N, P contents in needles of different positions during floral primordia formation stage and early stage of flower bud differentiation were investigated. The results showed that compared with P₀, the female strobilus of P₈ and P₁₆ were significantly increased by 67.4% and 61.2% in 2018 and 28.9% and 14.1% in 2019, respectively. There was a significant negative correlation between the female strobilus with the N content and N/P, a significant positive correlation between the female strobilus and the P content in needles. The responses of N and P contents in needles to P fertilization differed in clones with different fruiting abilities. In floral primordia formation stage, the N content of clones with weak fruiting ability was high, and the N/P was 11.5-12.5, while the P content of clones with strong fruiting abilities was high, and the N/P was 9.5-10.5. During this period, the P content of most clones under P₈ treatment was the highest, while the N/P was lowest. In the early stage of flower bud differentiation, the N/P of two fruiting clones was 15.3-17.0 and 13.2-15.1, respectively. The P content in upside layer was significantly higher while N/P was significantly lower than that in middle and lower layers. In conclusion, the 800 g P fertilization per plant could increase the P content and reduce the N/P of needles during the floral primordia formation stage of clones with diffe-rent fruiting abilities, which was beneficial to the formation of female strobilus and promote the yield of clone seed orchards.

Key words: Pinus massoniana, clone, fused calcium magnesium phosphate, female strobilus, nitrogen and phosphorus nutrition

ZHENG Yi, ZHANG Zhen, FAN Jin-gen, TONG Qing-yuan, CHEN Sheng-long, XU Zhi-qi, ZHOU Zhi-chun. Effects of P fertilizer on female strobilus and needle N and P nutrition of Pinus massoniana clones with different fruiting abilities.[J]. Chinese Journal of Applied Ecology, 2021, 32(4): 1184-1192.

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