Introduction and Seedling Raising Techniques of Pinus gerardiana
The germination rate of Pinus gerardiana seeds treated with different concentrations of gibber-ellin and the height and ground diameter of Pinus gerardiana seedlings with different seedling matrix were comprehensively evaluated.Three concentrations of gibberellin at 800,1000 and 1200mg/L were used to treat seeds,and CK was set as blank control.The forest humus soil,cultivated soil,laterite and bacteria coated soil were used as the raw materials of seedling matrix and a small amount of perlite and vermiculite were added to prepare three kinds of seedling matrix according to the same volume weighing method.A blank control group CK was set up.According to the design method of three repeated trials in a randomized block,the field experiment of the effect of seedling matrix on the seedling growth of Pinus gerardiana was ar-ranged.The results showed that gibberellin had the best germination rate at a concentration of 1000mg/L.According to the 3-stage experimental investigation,there were significant differences in the growth yield of Pinus gerardiana seedlings with 4 different growing matrix.The physical and chemical properties of Matrix 2(forest humus+peat+vermiculite)provided sufficient growth conditions for the seedlings,which had the greatest influence on the growth of the seedlings,followed by Matrix 3(laterite+forest humus+perlite),and the performance of Matrix 1(laterite+cultivated soil+forest humus)was poor.
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