Effect of Virus-free Plant and Subsoiling Reversion Soil for Reduction of Injury by Continuous Cropping of Sweet Potato

Abstract

To reduce the injury by continuous cropping of sweet potato (Ipomoea batatas (L.) Lam.), the farmer's plant and virus-free plant were cultivated with the density of 70×25 cm (June 10, 2011) in continuous cropping soil (CCS) and subsoiling reversion soil (SRS). Fertilizer was applied at the rates of 55-63-156 kg ha -1 (N-P 2 O 5 -K 2 O) and 10 ton ha -1 of cattle manure in CCS, and it was applied the 50％ increased cattle manure compost and nitrogen in DRS. Symptoms of viral infection were revealed in the farmer's plant at 30 days after planting, but there were no symptoms in virus-free plant. The yield of virus-free plant was more increased 15% and 10.5% than that of farmer's plant in DRS and CCS, respectively. The yield of sweetpotato in SRS was more increased 8.8% and 3.2% in farmer's plant and virus-free plant compared to CCS, respectively. In DRS, the rate of marketable tuber of virus-free plant was increased by 80% compared to the farmer's plant (60.1%). The virus-free plant was produced the tuber with more brilliant peel color and well-formed shape compared to the farmer's plant. The increased yield of virus-free plant and in SRS soil condition showed a positive relationship (p=0.05) with the number of leaf per plant at 30 days and the number of branch per plant at 120 days after planting. The results showed that the early growth after planting was very important for the development of storage root. Therefore, the deep-subsoil reversion and cultivation of virus-free plant could be reduced the injury by continuous cropping of sweet potato, and increased farm income.

Effect of Integrated Nutrient Management on Growth, Yield and Quality of Potato (Solanum tuberosum L.)

“…The diverse treatments were significantly influenced by using critical difference at a 5% level of significance tuber yield in weight categories (0-25g, 25-50g, 50-75g, and >75g). Treatment 5 consistently exhibited the highest tuber weights across all categories, with Treatment 5 > Treatment 4 > Treatment 3 > Treatment 2 > Treatment 1 Bongkyon et al, [13]. Furthermore, treatment 5 recorded the highest tuber yield at 9.243q/ha, followed by Treatments 4, 3, 2, and 1 Jaipaul et al, [14] and Khurana et al, [15] (Table 4 and Fig.…”

Evaluation of Plug Cell Size and Pinching out Followed by Layering for Mass Propagation Using Stem Cuttings of Virus-Free Sweet Potato Plantlets

“…국내에서도 SPFMV를 비롯한 바이러스 포장 감염률은 100%에 달하는 것으로 보고되었다 (Chung, 2008). 이에 따라 농가에서도 고구마 바이러스 무 병묘 재배에 대한 요구가 높아짐에 따라 무병묘의 생산과 급속증식 및 재배에 관한 연구들이 이루어지고 있으며 (Song et al, 2012;You and Lee, 2017), 일부 농업기술센터를 중심으로 무병묘 보급이 활발하게 이루어지고 있다.…”