《Table 5 Comparison of growth potentials and yields of B.striata with different weeding times》

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《Compound Planting of Bletilla striata under Forest in the Three Gorges Dam Area》

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As shown in Table 5，4 times of weeding during the cultivation of B.striata had the best effect.The results showed that the B.striata with 4 times a year of weeding had excellent growth potential，and the average plant height was 33 cm，23 cm，12 cm higher than that with 1 times，2 times，3 times a year.The yield（dry）of B.striata with 4 times a year of weeding was 4 230kg/hm2，and the yield per unit area increased by 240.1%，137.0%，and 43.9%，respectively，compared to the unit area yield of B.striata with 1 times，2 times，3 times a year.It is advisable to conduct weeding for 1 times in early May，early July，early August and late September throughout the growth cycle of B.striata，which will benefit the growth and development of B.striata.Moreover，the intertillage weeding should be shallow，and the surface soil should be loosened with weeds thoroughly removed.