Study On Laws Of Root Growth Of Winter Date And Soil Management In The Area Of Yellow River Delta

This topic investigated root system anniversary laws and fruit output in the several different winter date orchard in the area of Yellow River delta,studied the anniversary dynamic change rule of winter date root growth in the Yellow River delta area and the root system vertical distribution rule,and studied the root growth and the single output under the several soil management such as the vegetation,increasing organic fertilizer,intertilled weeding.The result indicated that:For bumper crop orchard and extensive orchard,the anniversary growth change tendency of the growth root and the absorption root is close,the growth curve is the single peak curve; there is a peak in the beginning of August;both growth root and the absorption root distribute in the 0-60cm soil layer;in every time and layer,the quantity of the growth root and the absorption root in the bumper crop orchard is higher than the quantity in the extensive orchard. The bumper crop orchard absorption root sends the root earlier than the extensive orchard absorption root,the quantity is also more.At the end of March to mid-April,the absorption root growth is rapid in bumper crop orchard.The absorption root growth of extensive orchard is slow in the earlier period.After vegetation,for the winter date root,the quantity in surface layer increases very much,especially,the absorption root quantity surpasses any other processing results.Under this processing,winter date single output has much enhancement comparing with the conventional management.By increasing organic fertilizer,the root growth quantity of each layer increases a lot,especially the intermediate absorption root ; Under this processing,winter date single output is the highest in the four processing.Under intertilled weeding,the growth root and the absorption root in the surface layer chang a lot,and the changing is not steady;the growth quantity of intermediate root is relatively more,the changing is steady;Under this processing,the winter date single output is slightly higher than the comparison processing output, but it is more inferior than the output under vegetating and increasing organic fertilizer.