Effects of Loss-control Fertilizer as Basal on Potato Growth and Quality under Drip Fertigation

FENG Zhiwen; KANG Yaohu; WAN Shuqin; LIU Shiping

doi:10.13522/j.cnki.ggps.2017.0093

Abstract：[Objective]Study on the application effect of loss-control fertilizer as base fertilizer on potato in drip fertigation.[Method]A 2-year field experiment of loss-control fertilizer as basal on potato growth,tuber yield, and marketing quality for two potato cultivars(including Kexin No.1 and Shepody)was carried out to study the application effects of loss-control fertilizer on potato under drip fertigation.Drip fertigation was triggered when the soil matric potential at 20 cm depth under the emitters was below-25 kPa.[Result]The results showed that, loss-control fertilizer applied as basal effectively improved the soil moisture in the rootzone,and promoted the growth of potato during the early tuber bulking compared with the compound fertilizer. Plant height and above ground biomass of Kexin No.1 with loss-control fertilizer as basal was increased by 4.9%~5.1% and 2.3%~9.9%, respectively.Meanwhile,leaf area index and aboveground biomass was increased by 32.7% and 45.1% for Shepo-dy, respectively. Loss-control fertilizer applied as basal improved the tuber bulking of Kexin No.1 (tuber was bulked relatively early),increased potato yield by 6.8%~13.1%,increased single tuber weight by 2.8%~6.4%,in-creased big tuber percentage by 3.4%~4.5%,and improved marketable tuber percentage by 0.7%~2.5%.While loss-control fertilizer was adverse to rapid tuber bulking with Shepody(tuber was bulked relatively late)in the late growth stage,which decreased the single tuber weight by 9.5%~15.1%,reduced total and marketable tuber yield by 7.5%~14.1% and 5.7%~8.6%,respectively.[Conclusion]Loss-control fertilizer is recommended as bas-al for Kexin No.1(tuber is bulked relatively early),while not recommended as basal for Shepody(tuber is bulked relatively late)under drip fertigation.