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| Studies on Optimized Fertilization of Drip Irrigation for Head Lettuce Facility Cultivation in Autumn at Outskirts of Beijing |
| ZHAO Qingchun1，CHEN Juan1*，LIAO Hong1，CHEN Suxian1，ZHAO Kaili1，FU Yucui2，HAN Bao3，GU Xingyu4 |
| 1Beijing Soil and Fertilizer Workstation，Beijing 100029，China；2Beijing Yongshengyuan Agricultural Planting Center，Beijing 101149，China；3Planting Industry Technology Extension Station，Fangshan District of Beijing，Beijing 102400，China；4Agricultural Technology Extension Station，Changping District of Beijing，Beijing 102200，China |
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Abstract In order to solve the problems of unreasonable fertilizer input and quality decline of head lettuce under the condition of protected soil cultivation，this paper took head lettuce in autumn as test material and studied the effects of optimized fertilization of drip irrigation in facility cultivation on head lettuce yield，quality and economic benefits．The results showed that comparing with the current farmers’habit for fertilization，the optimized fertilization（27-5-21 water-soluble fertilizer in seedling stage，24-4-27 water-soluble fertilizer in rosette and heading stages）could save N，P2O5 and K2O by 34%-49%，0-22% and 22%-39%，respectively and still obtain the same yield；reduce the nitrate content of head lettuce by 14%-20%；and improve economic benefit by 14%-24%．
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Received: 15 May 2020
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