Estimation of growth stage-based nitrogen supply levels for greenhouse semi-forcing zucchini cultivation

Self Cite

The standard growth-stage-based fertigation schedule has provided the weekly supply amount of fertilizer considering the expecting yield with no regard of soil nutrient status. The study aimed to examine if fertigation with nitrogen applied at a standard rate results in the best cucumber yield in two greenhouses with different soil nutrient levels, i.e. optimal and high. We investigated the nitrogen (N) uptake pattern of cucumbers with the different nitrogen supply levels which included half the standard rate (N0.5), the standard rate (N1) and double the standard rate (N2). In year 2020, the N1 amendment resulted in highest yield in the soil with optimal nutrient level, however, lower N0.5 resulted in higher yield in the high-nutrient soil. In year 2021, there was no statistical difference in the yield by different nitrogen supply levels in both soils with optimal and high nutrient level. Soil NO 3 -N remained low in the low nutrient soil regardless of the amount of N supplied, but soil NO 3 -N was high in the high nutrient soil supplied with N2. The Partial Factor Productivity of Nitrogen (PFPN) was highest in the N0.5 and it decreased as N supply increased in the optimal and high nutrient soil. In conclusion, a precise fertigation schedule is needed to be set with the consideration of the soil nutrient status.

Section: Introductionunclassified

Varying Nitrogen Fertigation for Cucumbers Grown in Greenhouses with Soil of Optimal or High Nutrient Status

Kim¹,

Lee²,

Song³

et al. 2022

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“…작물의 안정적인 생산, 비료의 효율적 이용 및 농업생산환경의 보전 등 합리적인 관비재배기술의 장점은 시설재배 에서 재배하는 과채류 (고추, 오이, 토마토, 오이, 애호박, 참외 등)와 엽/근/인경채류 (양파, 브로콜리, 상추, 시금치, 무 등) 등 많은 작물에 대하여 적정 관비공급량, 작물 생산성 등이 연구된 바 있다 (Cho et al, 1998;Moujabber et al, 2002;Kang et al, 2003;Jung et al, 2005;Ewais et al, 2010;Badr et al, 2011;Ha et al, 2015;Sung et al, 2016;Chauhdary et al, 2017)…”

Section: Introductionunclassified

“…Mineral nutrients uptake and optimal requirement for 9 vegetable crops with fertigation system. 여 양분요구량 (질소, 인, 칼륨)을 산정하였다 (Table4), 주요 시설재배작물을 관비형태로 양분을 공급하는 경우, 양 분의 흡수/이용효율은 상대적으로 높게 나타났으며, 특히 질소의 경우 노지공급량 대비 25% 가량 절감이 가능한 것 으로 보고된 바 있다 (Jung et al, 2010;Ha et al, 2015;Sung et al, 2016)…”

unclassified

Optimal Fertilizer Requirement for 9 Greenhouse Vegetable Crop Cultivation with Fertilization System: On-Site Survey

Lee

Sung

2019

Self Cite

The fertigation system has continuously been increasing to extend crop cultivation, to provide simultaneously water and mineral nutrients, and to finally enhance yield and quality. The fertigation has a strength to regulate water and fertilizer relatively freely without any limitation of time, quantity, and type of fertilizers. However, a decision for those extremely depends on farmer's experience due to an absence of standardized fertigation manual for each crop. As a measure to solve these problems, it should be firstly considered when, what and how farmers implement various requirements, and thus we surveyed some basic information to make a concept for crop-customized fertigation manual. The workflow was as followed: 1) choose crops → 9 major vegetables growing with fertigation, 2) monitor massive production area and select 2 sites with different cultivation period, 3) on-site survey and sampling at least two times during cultivation, early harvest and maximum harvest stages, and 4) analyze soil and plant samples and compute optimal rates for crop-and cultivation type-customized fertigation. Plant density was greater in forcing cultivation, and application rates were relatively higher in sequential harvest. The ratio of top dressing (fertigation) to total application generally ranged from 60 -80% although some farmers were beyond the bounds. Mineral nutrient contents (N, P, and K) were more concentrated in Solanaceae, and it was observed that the quantity and concentration of fertigation were higher in sequential (e.g. cucumber) compared to once (e. g. watermelon). Given the result from the present on-site survey, it is carefully suggested to revise an application rate of top dressing for fertigation, to make the standardized-or customized-fertigation manual by crops, to implement practical means to optimize soil mineral contents, and to extend an education about application of smart and effective fertigation for farmers.

“…앞서 설명한 바와 같이, 시설재배는 비가림을 통한 공기유통의 차단, 난방 및 작물재배기간의 다양화로부터 요구되 는 고도의 관리기술이 필요하다 (Hong et al, 1996;Ko, 2001;Jang, 2004). 또한 양분관리 측면에서도 2000년 이전에 는 밑거름을 공급하고 재배과정 중 2 -3의 웃거름을 공급하였으나, 양분의 효율적인 이용을 위해 비료를 물에 녹여 필 요한 시기에 필요한 양을 공급하는 관비기술이 급속도로 발전하여 (Jeong, 2001;Park and Hong, 2001;Nam, 2002;Jung et al, 2005;Jung et al, 2010;Ha et al, 2015;Sung et al, 2016;Lee et al, 2018) 우리나라 시설재배농가의 약 58%가 관비 (점적, 지중관개 등) 방식으로 양분을 공급하고 있다 (MAFRA statistics, 2016).…”

unclassified

Optimal Levels for Nutrient Diagnosis of Crops and On-Site Application: Dry- or Water Soluble-Based Leaf Analysis

Lee¹,

Lee²,

Sung

2019

Self Cite

It is one of most important works to recognize the nutritional status of crops for promoting best nutrient management. Furthermore, a rapid and accurate diagnosis of mineral nutrients is strongly required at agricultural on-site. Here, we described the optimal range for favorable crop growth and development based on the results of previous researches performed since 1990 in NAS, RDA, and focused on explaining analytical method and optimal range of water soluble-based N, P and K for greenhouse crops. Water soluble mineral N, P and K differently responded with leaf position and crop; overall, soluble N was higher in fully expanded leaves, soluble P was relatively higher young leaves and soluble K constantly remained in all leaves. Given the results, water soluble mineral nutrients of greenhouse crops showed relatively higher in Solanaceae (e.g. paprika and eggplant) than in Cucurbitaceae (e.g. cucumber and watermelon). In this respect, the nutrient management in terms of fertilization and crop uptake is necessary to make crop-specific strategy. Although the criteria for nutrient diagnosis based on water soluble extracts was described in this paper, we carefully suggest that better criteria for nutrient diagnosis should be advanced with consideration for diurnal pattern of water soluble minerals, difference in sample destruction degree, duration of storage of samples taken, and etc.