Effect of the mixed sowing management on nutrition supply of green manure system in Gaocong tea garden

It is important of increase Green manure production for to control chemical fertilization intensity in Gaocong tea garden system, and mixed sowing is one way of its yield growing. In order to choose green manure mixed sowing plan, the competition relationship of different green manure species need to be studied. The experiment of sowing Brassica napus（Y), sowing Vicia benghalensis（S）and mix-sowing Brassica napus and Vicia benghalensis（YS）was carried out in Gaocong tea garden in Wuyisan Xingtian, and items of dry matter yield, nutrition apply amount, land equivalent ratio was been observed and the competition ratio was analysed. Result shows that dry matter yield ranged as S（1554.36 g·m⁻²）＞ Y（881.75 g·m⁻²）＞ YS（725.16 g·m⁻²), and the content of N and P₂O₅ were significantly higher than that of Y and YS, but the difference between C and K₂O was not significant. The C supply amount ranged as S of 503.23 g·m⁻², Y of 432.82 g·m⁻², and YS of 265.79 g·m⁻², N supply as S of 47.43 g·m⁻², Y of 18.68 g·m⁻², and YS of 17.81 g·m⁻², P₂O₅ supply as S of 6.42 g·m⁻², Y of 4.88 g·m⁻², and YS of 3.71 g·m⁻², K₂O supply as S of 16.90 g·m⁻², Y of 9.31 g·m⁻², and YS of 7.60 g·m⁻². The land equivalent ratio of mix-sowing Brassica napus and Vicia benghalensis was 0.65, and the competition ratio of Brassica napus and Vicia benghalensis was 1.52 and 0.66, respectively. Thus, mix-sowing Brassica napus and Vicia benghalensis perform low dry matter yield. The competition between Brassica napus and Vicia benghalensis is obvious, with Brassica napus of seemly higher competition ratio. So, the recommend management for Gaocong tea garden system is sowing Vicia benghalensis.