Application Of Drip Fertigation And Sprinkler Fertigation On Chinese Cabbage And Broccoli

Fertigation was conversed as an efficient method to save water and fertilizer,but also to increase labor efficiency,as well as to improve the quality of products.In this study,the fertilizer amounts were regulated in 2017 according to the results of the field experiments in 2016.Chinese cabbage and Broccoli were used as conventional fertigation?CN?,complete fertilization of drip fertigation?DH?and sprinkler fertigation?SH?,N,P₂O₅,K₂O levels were 240-240-300 kg/hm²,Chinese cabbage and Broccoli were used as drip fertigation and sprinkler fertigation experimental vegetables with two fertigation levels,For Chinese cabbage,two N,P₂O₅,K₂O levels were 192-192-240kg/hm²?DL and SL?,216-216-270 kg/hm²?DM and SM?,but for Broccoli,two N,P₂O₅,K₂O levels were144-144-120 kg/hm²?DL and SL?and 192-192-210 kg/hm²?DM and SM?.At the same time,zero fertigation was used as blank control?CK?.The objective is to study the effect of the drip fertigation and sprinkler fertigation on Chinese cabbage and Broccoli,and explore the fertilizer management in the fertigation technology.Which can provide therotical foundation and application reference for Chinese cabbage and Broccoli fertigation technology.The main results were as follows:?1?Compared with conventional fertigation?CN?,both drip fertigation and sprinkler fertigation can significantly increased the aboveground biomass and the package weight,hight and circumference of Chinese cabbage.The commercial yield of Chinese cabbage in drip fertigation with DL,DM and DH treatments increased 22.8%,42.0%and 59.3%respectively compared with CN,and those in sprinkler fertigation increased 35.0%,55.0%and 66.3%respectively.Both drip fertigation and sprinkler fertigation can increased the Vc concentration of the Chinese cabbage,SH treatments increased by 38.2%,it is the maximum increase.Compared with conventional fertigation?CN?,Drip fertigation has little effect on the nitrate concentration of the Chinese cabbage,sprinkler fertigation has higher nitrate concentration,and however,the nitrate concentration at all treatments are lower than the standard limitation.This indicates that SH treatment with sprinkler fertigation has the best effect on improving the yield and quality of Chinese cabbage.?2?Compared with conventional fertigation?CN?,drip fertigation and sprinkler fertigation significantly improved the use efficiency of N,P and K fertilizers.The utilization rates of N,P and K in sprinkler fertigation with SM and SH treatments increased by 184.4%and 205.5%,123.7%and 121.7%,103.8%and 111.4%respectively,and with no differences between SM and SH treatments.?3?Compared with conventional fertigation?CN?,drip fertigation and sprinkler fertigation can enhance the growth of broccoli,and increased the flower bulbs weight.The Drip fertigation with DH treatments increased the commercial yield by 8.60%,and in the sprinkler fertigation with SM and SH treatments increased 8.30%and 19.6%respectively.Compared with conventional fertigation?CN?,drip fertigation and sprinkler fertigation has little effect on Vc of Broccoli ball.Nitrate concentration in the drip fertigation with DL,DM and DH decreased by27.5%,24.9%and 16.9%respectively,but those in the Sprinkler fertigation decreased 20.5%,10.6%and 4.78respectively.However,the nitrate concentration at all treatments are lower than the standard limitation.Comprehensive yield and quality,sprinkler fertigation with SH treatment performed best.?4?Compared with conventional fertigation?CN?,drip fertigation with DL and DM treatments had little effect on the N,P and K utilization efficiency for Broccoli,but those of DH treatment increased 11.9%,23.0%and 18.9%.The N,P and K utilization efficiency in the sprinkler fetigation with SL,SM and SH treatments increased 41.0%,38.2%and 53.5%,30.9%,29.1 and 50.7%as well as 59.1%,56.4%and 36.8%.This indicates that sprinkler fetigation with SH treatment of broccoli has the highest fertilizer utilization rate.?5?Compared with conventional fertigation?CN?,drip fertigation?DH,DM and DL?reduced the soil nitrate concentration in 0-10cm and 10-20 cm soil profile by5.06%-37.0%and 15.2%-32.6%respectively.But in Sprinkler fertigation,they decreased by 12.0%-32.3%and 23.8%-40.1%respectively.Both drip fertigation and sprinkler fertigation significantly reduced the electrical conductivity?EC?,available N,P and K of topsoil,but has little effect on soil organic matters.Drip fertigation and sprinkler fertigation can reduce the nitrate concentration in soil profile in Broccoli plots,and lower the electrical conductivity?EC?,available N,P and K of topsoil,but has little effect on soil organic matters.This is similar to Chinese cabbage.In sum,compared with farmers conventional fertigation management,both drip fertigation and sprinkler fertigation can increased the commercial yield of Chinese cabbage and Broccoli,improved the quality of products,increased the utilization efficiency of N and K fertilizers especially,decreased the nitrate concentration in 0-10cm and 10-20cm soil profile and the EC on the topsoil.And sprinkler fertigation showed better resultant effect than the drip fertigation.So,sprinkler fertigation is more suitable for Chinese cabbage and Broccoli cultivation,and the fertilizers can be used in8 times according to the demand in different growth period,the proportion of fertilization was 5%,5%,10%,15%,20%,20%,15%and 10%respectively.