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杉木种子园含硼量测定和施硼试验*

Measurement of Available B Content and the Effect on Application of B Fertilizer in Chinese Fir seed Orchard

  • 摘要: 据对浙江杉木一代种子园的土壤、植株针叶和球果抽样测定表明,土壤中水溶性硼含量只有0.13~0.24ppm,大大低于0.5ppm的临界浓度。针叶和球果中有效硼含量也分别只有8,9~22.7ppm和4.1~16.1ppm,也低于正常含量。经四年施硼试验研究结果表明,进入正常结实期的杉木种子园施入一定量的硼肥,其单株和单位面积的球果产量分别比对照平均增产35.08%和48.42%,出籽率提高9.40%,发芽率提高14.99%,千粒重增加6.54%.施肥时间以4月中旬和6月中旬以前为佳,每株施60g硼砂较为适宜。试验结果还表明,硼肥和复合肥配比混施增产效果更加明显,单株和单位面积球果产量分别比单施复合肥和硼肥增产22.55%和15.71%以上,种子品质也有显着提高。

     

    Abstract: The samples of soil and plant's needle,cone taken from Zhejiang's Chinese fir seed orchards were tested,And the results showed that the content of water-soluble B in soil is only 0.13~0.24 ppm,which is obviously lower than the critical concentration of 0.5 ppm.The B contents of plant needle and cone are only8.9~22.7 ppm and 4.1~16.1 ppm respectively,which is also lower than the normal one. Applying appropriate amount of B to Chinese fir seed orchard, the cone yields of single tree and per hectare stand are averaged 35.08%,48.42% higher than those of the control respectively,the seed output rate is 9.40%,the germination percentage is 14.99% and the 1000-seed-weight is 6.54%,which is higher than that of the control. The best time for fertilization is likely to be before middle August and middle June. The proper amount of fertilizer used is 60 g borax generally. The study also revealed that the better yield could be achieved to apply B mixed with N,P,K fertilizers instead of Bor N,P, K mixed fertilizer seperately. The amount of cone of single tree and per hectare stand can be increased by 22.55% and 15.71% more with the compound fertilizer,and the seed quality could also be improved remarkably.

     

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