Effects of irrigating level in different stage to the growth and yield of kenaf

Through the pot experiment,has researched the effect of different irrigating level in different stage to the growth and yield of kenaf.Based on two kenaf varieties as Hongyou 2 and Fuhong 992,the treatment included three factors of growing stages as the seeding stage(A)with 3 irrigation levels as high water(A1),middle water(A2)and low water(A3);the vigorous growing stage(B)with 3 irrigation levels as high water(B1),middle water(B2)and low water(B3);the blossom bud stage(C)with 3 irrigation levels as high water(C1),middle water(C2)and low water(C3).Whole experiment adopted the Orthogonal design with randomized blocks and three repetitions.The results showed that:(1)The variety and the different irrigating level in,vigorous stage and blossom bud stage presented the significant effect to the dry matter production of kenaf.The effect sequence of irrigating level in different growth stage to kenaf yield as follows:Vigorous growing stageblossom bud stageseedling stage.The difference of the variety was Hongyou 2Fuhong 992.For the two varieties of Hongyou 2 and Fuhong 992,compared with the irrigating level B3,the fiber dry mass of B1 and B2 was increased122.31% and 130.24%,49.27% and73.81%,respectively;compared with C3,the fiber dry mass of C1 and C2 was also increased 44.7% and 17.45%,20.39% and 5.00%,respec-tively.(2)Compared with B3,the plant height,stem diameter,bark thickness,main root length,dry mass aboveground of B1 and B2 total were increased,also each index of B1 were higher than B2,except the ratio of root and mass above-ground.(3)Compared with C3,the plant height,dry mass above-ground and dermal bone ratio of C1 and C2 were increased.The bark thickness and dry mass above-ground of C1 were higher than C2,which difference was notable.Under the conditions of this test,for two varieties of Hongyou 2 and Fuhong 992,the high water level in vigorous stage and blossom bud stage was useful to the accumulation of fiber dry mass,the difference was notable.But the different irrigating level in seedling stage was not notable to the fiber dry mass.Through the range analysis method,the optimal irrigation level combination in different growing stages was B1C1A1.