Study on coupling effect of water and nitrogen of celery plant in moun-tainous area of southern Ningxia
In order to solve the problems of shortage of water resources,extensive management of water and fertilizer and low utilization efficiency of water and fertilizer in the production of celery.The design of two-factor quadratic universal rotation combination was adopted.Through field experiment and laboratory analysis,the effects of irrigation amount and nitrogen application amount on the growth,yield and quality of celery and the coupling effect of water and fertilizer were studied.The objective was to provide scientific basis for the high yield,high quality,high efficiency and safe production of celery in the mountainous area of southern Ningxia.The results showed that the coupling of water and nitrogen significantly promoted the growth and development of celery,and increased plant height and stem diameter.With the extension of the growth period of celery,plant height and stem diameter showed obvious increasing trend,and the difference among different experimental combinations was significant.SPAD value showed a slow rising trend during the growth period,and the dif-ference was not significant during the growth period,but the difference between the combinations was significant.The coupling of water and nitrogen had significant positive effects on increasing the yield and improving the quality of celery.The coupling of water and nitrogen had significant positive effect on increasing the yield and improving the quality of celery.The highest yield of water-nitrogen combination 1 was 94.82 t·hm-2,which was 9.26% higher than that of combina-tion 5 with the lowest yield.Water and nitrogen combination 1 has the best quality.Excessive application of nitrogen fertilizer and irrigation could inhibit the improvement of celery quality.Under the conditions of this experiment,the main effect analysis shows that water is the main factor affecting celery yield and plays the main effect role in the formation of celery yield.According to the coupling effect equation of water and fertilizer,the optimal combination of water and nitrogen fertilizer of celery in facilities could be obtained as follows:irrigation amount of 1395 m3·hm-2+nitrogen fertilizer amount of 337.5 kg·hm-2,this combination can be extended to celery water and fertilizer management system for facilities in this area.
Mountainous area of south NingxiaFacilities celeryWater and fertilizer couplingCombined effect
万方数据
维普
