Abstract To explore the effects of irrigation modes and nitrogen，phosphorus and potassium ratios
on yield and water and fertilizer productivity of welsh onion，the effect of different irrigation methods drip
irrigation（Di），sprinkler irrigation（Si），furrow irrigation（Fi）and different fertilization ratios（NPK0，
N0PK，NP0K，NP0K0，N0PK0，N0P0K，N0P0K0 and NPK）on the yield and the efficiency of water and
fertilizer productivity of ‘Yuanzang’ welsh onion was studied. The results showed that compared with Fi，Di
significantly increased the yield of welsh onion，increased N，P2O5 and K2O absorption，fertilizer utilization
rate，and also significantly improved water production efficiency and irrigation WUE. The Fertilizer ratio
of welsh onion treated with NPK（N 500 kg · hm-2，P2O5 400 kg · hm-2，K2O 600 kg · hm-2）was higher，
followed by the reduction of one of the fertilizers，the single application of N，P，K fertilizers was lower. At
the same time，NPK also increased the N，P2O5，K2O accumulation and fertilizer utilization rate of all organs
of welsh onion. The results showed that under Di，the irrigation and fertilization system of full NPK fertilization
was the most reasonable.
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Received: 13 March 2019
Published: 02 July 2019
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