In the paper the sequence of forest tending operations in black locust stands is proposed, based on results of long-term stand structure and forest yieldtrials.
本文根据林分结构和森林产量长期实验林的研究成果，提出了刺槐林的抚育作业次序。
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On the other hand, trials at CIMMYT's principal wheat-breeding station at Obregon in Mexico indicate a slowdown in potential yield growth to only 0.4% a year.