Applicability of Conventionally Recommended Fertilizer Rates for Potato Cultivated in Saemangeum Reclaimed Land in the Fall Season

Abstract

It is important to increase the area of potato cultivation in the fall season for a stable year-round supply system in Korea. Saemangeum reclaimed land has the potential to extension of potato cultivation area with appropriate practices. This study was performed to test applicability of fertilizer recommendation in southern coastal area to the Saemangeum area. Two experiments were conducted: one experiment compared the yield response of potato between standard rates of N-P-K (SR) and recommendation rates of N-P-K based on soil test (STR) and the other experiment analyzed yield response to 4 different levels of N, P, K, respectively. The potato yield in SR was 6.05 Mg ha -1 on average and varied from 1.68 Mg ha -1 to 11.80 Mg ha -1 . The potato yield in STR, meanwhile, ranged from 8.13 Mg ha -1 to 12.17 Mg ha -1 with a mean value of 9.65 Mg ha -1 . Potato yield was increased linearly with N fertilization rates but P and K fertilization did not have any significant effect on potato growth. The N fertilization rate (NFR) and the soil available phosphate content (Av. P 2 O 5 ) had significant positive corelation with potato yield (p < 0.01). Based on stepwise multiple regression analysis, partial regression coefficient was 0.30 for NFR and 0.08 for Av. P 2 O 5 ; Y = 19.6 X 1 + 34.9 X 2 + 1,410, where Y, X 1 , and X 2 mean potato yield, NFR, and Av. P 2 O 5 , respectively. Conclusively, STR was strongly recommended for potato in the Saemangeum reclaimed land and the conventional standard fertilization rate was hardly applicable to the area, especially for nitrogen.

Spatial Variations in Salinity and Sodicity of Reclaimed Tideland Paddy Soils in Coastal Areas of Southwestern Korea

“…Though RTLs are responsible 22% of national rice production in South Korea, there are increasing social pressures on the use of RTLs for upland crops such as forage (Bae et al, 2021;Yun et al, 2021) and other cereal crops (Lee et al, 2021a(Lee et al, , 2021bOh et al, 2022) due to reduced rice consumption. Therefore, it is necessary to investigate the salinity status of RTLs for assessment of the suitability of RTLs for the cultivation of upland crops (Jeong et al, 2020).…”

Agricultural Water Salinity of Reclaimed Tidelands in Southwestern Coastal Areas of South Korea

“…따라서, 습해 우려가 없고, 재배기간 동안 주기적인 관개로 일시적 제염이 용이한 벼 (Oryza sativa L.)를 주로 재배하고 있다 (Park et al, 2022). 하지만, 최근 쌀 소비량 감소 등에 의해 간척지 밭 작물 재배 필요 성이 증가하고 있어, 간척지 토양에서 사료작물 (Jang et al, 2020;Bae et al, 2021;Yun et al, 2021), 서류 (Lee et al, 2021a), 곡류 (Lee et al, 2021b;Oh et al, 2022) 등 다양한 작물 재배를 위해 토양 염농도 관리 기술 개발에 대한 연구 가 진행되고 있다 (Jeong et al, 2020;Seo et al, 2022).…”