植物生长调节剂对西南桦苗木生长的影响

用 ABT6 和 GA3对西南桦苗木进行叶面喷施试验。试验结果表明 ,GA3的 3种浓度即 2 0× 10 - 6 m g/L、50× 10 - 6 m g/L、80× 10 - 6 m g/L在苗木高生长、地径大小、苗木干鲜重及苗木根系生长发育方面都比清水对照( CK)有明显地提高。ABT6 各浓度特别是 50× 10 - 6 m g/L处理的在苗木分枝数、单株叶面积、苗木干鲜重及苗木根系生长发育方面也比对照有显著的提高。综合各指标 ,用 A BT6 生长调节剂的 50× 10 - 6 mg/L比 2 0× 10 - 6mg/L、80× 10 - 6 mg/L处理及 GA3生长调节剂各浓度处理在生产实践上更适宜用于培育西南桦苗木。

Influence of plant growth regulators to the grow- th of the Betula alnoides Buch-Ham plantlet

The experiment was carried out to observe the growth of the Betula alnoides Buch-Ham by spraying two plant growth regulators ABT 6?GA 3 in its leaves. The result showed that the treatment sprayed GA 3(20×10 -6 mg/L,50×10 -6 mg/L,80×10 -6 mg/L)increased much more than that of water control in shoot height, diameter, nursery stock's fresh and dried weight, growth of root system. In the treatment sprayed ABT 6 the nursery stock's branch quantities,leaf area per plant,fresh and dried weight,growth of root system all improved remarkable than those of contrast too,the experiment shows that the density 50×10 -6 mg/L of ABT 6 is much better to cultivate the Betula alnoides Buch-Ham nursery stock than the other two densities and GA 3 regulators in productive practice.