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| Effects of Water and Nitrogen Treatment on Yield，Water and Soil Nutrition
Use Efficiency of Broccoli |
| JIANG Li，ZHANG Guo-bin，ZHANG Jing，LI Jie，YU Ji-hua * |
| （College of Agronomy， Gansu Agricultural University， Lanzhou 730070， Gansu， China） |
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Abstract Abstract：Taking field test method，this paper studies the effects of different irrigation quantity
and nitrogen application on yield，water utilization efficiency and root zone soil nutrition contents of
broccoli（Brassica oleracea L. var. italica Plenck）planted at north-west plateau. The results showed
that the yield of broccoli by treatment of medium water and high nitrogen（ W2N1） was the highest. It
could reach 2 035 kg·（667 m2）-1，which was 36.30% higher than low water low nitrogen treatment
（W3N3）．But，water utilization efficiency increased along with the decrease of irrigation quantity. The
highest water use efficiency 35.08 kg·m-3 appeared with the low water high nitrogen treatment（W3N1）．
The dry matter accumulation quantity increased with the increase of water and nitrogen quantity，but it
would decrease when their quantities exceeded certain dosage．Medium water high nitrogen treatment
（W2N1） had the best effect．Under different water and nitrogen treatment，in 0-20 cm soil layer the
contents of soil available N，P and K would nave the tendency of rising firstly，then falling down. The application quantity of P and K was even larger than their absorption，big quantity was left in soil．To
put it short，planting broccoli in north-west plateau the best treatment is medium water high nitrogen
（W2N1） - the nitrogen fertilizer applying quantity is 27.6 kg·（667 m2）-1 and irrigation quantity is
83.52 m3·（667 m2）-1．
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Received: 10 January 2013
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