The control efficiencies of 6 chemical herbicides were studied during flax seedling -stage in winter.The results showed that the weed control effects of three treatments were better.They were 56% MCPA soluble powder 750 g &20% quizalofop -p -ethyl missible oil per hectare,30% Benazolin suspension 600 g &20% quizalofop -p -ethyl missible oil per hectare,and 80% Diuron wettable pow-der 1500 g per hectare respectively.And they were safe to the growth of flax and could be applicated dur-ing flax seedling -stage in winter.

The field fertilizer tests with 3414 Model recommended by Ministry of Agriculture were studied by fertilizing Nitrogen,Phosphorus and Potassium in flax fields in winter.The results showed that Nitrogen,Phosphorus and Potassium all had effect on straw,seed and fibre yields of flax.Compared with other treatments,the non-nitrogen treatment was significantly different.Regression models were established on the basis of the three-factor-quadratic functions,the fitting degrees were good.These models could provide a reference for practical production.