Effects of water and nitrogen coupling on growth and yield of Carthamus tinctorius L.under mulch drip irrigation
[Objective]To study the effects of water and nitrogen coupling on the growth,dry matter ac-cumulation and yield of Carthamus tinctorius L..[Methods]The split area test design was adopted,with the irrigation volume as the main area.Before sowing,basic fertilizer diammonium phosphate(64％of total nutri-ents,N-P2O5=18-46)150 kg/hm2,potassium oxide(30％)75 kg/hm2were applied and two factors of irrigation water(W)and nitrogen application rate(N),three irrigation water levels were set:W1:1,200 m3/hm2(low irrigation rate),W2:1,500 m3/hm2(middle irrigation rate)and W3:1,800 m3/hm2(high irrigation rate),three nitrogen application levels:N0:no nitrogen application(contrast),N1:300 kg/hm2(traditional nitrogen application rate)and N2:600 kg/hm2(high nitrogen application rate).During the test,the agronom-ic characters,dry matter accumulation and yield of Carthamus tinctorius L.under different treatments and dif-ferent periods were measured,and the effects of different water and nitrogen treatments on the growth and yield of Carthamus tinctorius L.were evaluated.[Results]The appropriate amount of irrigation and fertilization had a significant role in promoting the growth and development of Carthamus tinctorius L..The plant height,num-ber of branches,number of leaves and other agronomic traits of Carthamus tinctorius L.under W2N1 and W2N2 treatments were significantly higher than those under other treatments.The dry matter accumulation rate and a-mount,number of fruit balls per plant and number of seeds per fruit of Carthamus tinctorius L.under W2N1 treatment reached the highest level,and the filament yield and grain yield under W2 treatment were significant-ly increased by 8.09％and 20.84％compared with W1 and W3 treatment,under N1 and N2 treatment,the difference was small,but they were significantly increased by 10.69％and 25.66％compared with N0 treat-ment.[Conclusion]Irrigation amount and traditional fertilization amount(W2N1:1,500 m3/hm2 of irrigation and 300 kg/hm2 of fertilization)are combination of water and nitrogen,which can promote the growth and de-velopment of Carthamus tinctorius L.,provide water and fertilizer utilization efficiency,increase dry matter ac-cumulation,coordinate yield components,thus achieving the goal of high yield and quality of Carthamus tinc-torius L..
Carthamus tinctorius L.water nitrogen couplingdry matter accumulationgrowth and de-velopmentyield
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