Solar Radiation-Driven Irrigation Optimization for Grafted and Non-Grafted Green Pepper Seedlings in ICT-Monitored Greenhouse

Myeong Suk Kim; Ji Ho Kim; Ji Hye Jang; Min Sil Ahn; Jun Gu Lee

doi:10.12791/KSBEC.2025.34.3.342

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2025 Vol.34, Issue 3 Preview Page Next Page

Original Articles

Solar Radiation-Driven Irrigation Optimization for Grafted and Non-Grafted Green Pepper Seedlings in ICT-Monitored Greenhouse ICT 온실 활용 풋고추 수경재배 시 실생묘와 접목묘의 일사량 기반 급액량 설정

31 July 2025. pp. 342-350

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Abstract

This study aimed to evaluate the growth, productivity, and nutrient uptake of non-grafted and grafted green pepper (Capsicum annuum) seedlings under solar radiation-based irrigation control using ICT in a hydroponic system. Non-grafted ‘Soonhangilsang’ and grafted (‘Soonhangilsang’ scion × ‘BN901’ rootstock) seedlings were cultivated in coir substrate from late August to the following April. Irrigation was controlled at four levels (T1－T4) based on cumulative solar radiation measured by ICT sensors. In non-grafted seedlings, the T2 irrigation level (50－160 mL·100J^-1·plant^-1) achieved the highest irrigation efficiency, as increased irrigation beyond this level showed minimal yield improvement and excessive drainage. Grafted seedlings, however, showed significantly higher productivity at the T4 level (70－240 mL·100J^-1·plant^-1), yielding 6,306 g·plant^-1, approximately 34% more than non-grafted plants at the same irrigation level. Leaf sap and tissue analysis revealed a decline in total nitrogen and phosphorus and an increase in potassium as the growing season progressed. While non-grafted seedlings exhibited higher sap nutrient concentrations, these values showed low correlation with leaf nutrient content and yield, especially for nitrogen. These findings suggest that grafted plants benefit from increased irrigation under solar radiation-based control, and that accurate diagnostic use of sap analysis requires standardized sampling protocols. ICT-based irrigation and environmental management offers a promising approach to optimizing long-term hydroponic pepper cultivation.

Keywords

Capsicum annuum L.

coir substrate

drainage rate

sap analysis

smart farm

vapor pressure deficit

본 연구는 풋고추 수경재배에 ICT 기술을 적용하여 측정된 누적 일사량을 기반으로 급액량을 설정하고, 이를 바탕으로 실생묘와 접목묘의 생육 및 생산성에 미치는 영향을 평가하고자 수행되었다. 실험재료로는 실생묘 ‘순한길상’과 접목묘 ‘순한길상’(접수) + ‘BN901’(대목)을 사용하였으며, 65－70일 간 육묘한 뒤 코이어배지에 8월 하순에 정식하여 이듬해 4월까지 재배하였다. 급액량은 ICT 센서를 통해 측정한 누적 일사량을 기준으로 T1－T4의 4수준으로 처리하였다. 풋고추 실생묘 수경재배 시 급액량 T2(생육초기－중기: 50－160mL·100J^-1·plant^-1) 처리 이상에서 생육초기 과실의 품질 차이가 일부 있었으나, 정식 후 54일차 이후로는 품질에 차이가 없고, 생산량 증가도 미미하기 때문에 양액 사용효율을 고려하였을 때 적정 급액량은 T2로 판단되며, 이때의 배액률은 사분위수 범위(Q3-Q1)를 기준으로 생육초기 13－31%, 생육중기 20－34%로 관찰되었다. 접목묘의 경우 T4(70－240) 처리에서 총생산량 6,306g·plant^-1으로 유의하게 높았으며, 실생묘 T4 처리구 보다 약 34% 증수하였다. 이를 통해 풋고추 수경재배의 접목묘 도입 시 장기간 세력 유지와 생산성 향상에 유리하며, 실생묘와는 차별화된 급액 전략이 필요할 것으로 판단된다. 또한, 엽병 즙액 및 엽 조직 내 총질소, 총인, 칼륨 함량 분석 결과, 생육 후기로 갈수록 총질소와 총인은 감소하고 칼륨은 증가하는 경향을 보였으며, 실생묘에서 엽병 즙액 내 N, P, K 함량이 전반적으로 높게 나타났다. 그러나 엽병 즙액 분석값과 엽 조직 내 함량 간 상관성은 질소에서 낮았고, 생산성과의 관련성도 미미하여, 즙액 분석을 활용한 생육 진단의 신뢰도를 높이기 위해서는 시료 채취 위치, 수분 상태, 엽령 등 명확한 기준 설정이 요구된다.

키워드

배액률

수증기압포차

스마트팜

즙액분석

코이어배지

Capsicum annuum L.

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Information

Publisher :The Korean Society for Bio-Environment Control
Publisher(Ko) :(사)한국생물환경조절학회
Journal Title :Journal of Bio-Environment Control
Journal Title(Ko) :생물환경조절학회지
Volume : 34
No :3
Pages :342-350
Received Date : 2025-07-21
Revised Date : 2025-07-28
Accepted Date : 2025-07-29
DOI :https://doi.org/10.12791/KSBEC.2025.34.3.342

Journal of Bio-Environment Control ISSN:1229-4675(Print) 2765-3641(Online) 생물환경조절학회지

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