《Table 2 Total N, total P, total K and biological production of green manure crops (August 22)》

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《Effects of Rotating Summer Green Manure Crops and Straw Returning in Paddy Field on Rice Quality and Yield》

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The Duncan test method is used；no letter is used to show the significant difference in the same column（P<0.05）due to the fact that the number of groups is less than three.

As shown in Table 2，the differences in total N，total P，total K，number of plants，and biological yield of mung bean and lablab bean reached extremely significant levels，indicating that under normal water and fertilizer management conditions，the growth characteristics of different green manures determined the amounts of nutrient absorption and biological yield of crops.The total N，total P，total K，plant number and biological yield of mung bean were2.088%，0.663%，1.752%，692.67/40 m2，and 1.58 t/hm2，respectively.Compared with mung bean，lablab bean had the total K and biological production increased by 70.38 and 37.34%，while the total N，total P and plant number decreased by 4.36，32.43，and 55.58，respectively.As the mung bean is a kind of compact crop with upright plant type，its seeding size was 50 cm×17 cm.When the mung bean grew to 18 cm high，the plants with weak growth vigor were removed，leaving only the strong ones.Each hole had 1 plant.At last，the remaining plants of mung bean in each plot were 385.02 more than that of lablab bean.