Influence of Drip Irrigation and Drip Fertigation on the Yield of Bell Peppers in Open Fields

Takeshita, Masanori; Nakanishi, Kazuhiro; Takahashi, Takehiro; Minohara, Takashi; Maeyama, Toshiyuki; Tomatsuri, Masaru; Masumitsu, Hiromi; Goto, Hajime

doi:10.4035/jsfwr.53.183

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Most of the studies on drip fertigation in open fields have involved woody species such as tea (Shirai et al 2006, Shirai et al 2010) and citrus (Morinaga 2010). The literature on drip fertigation of vegetables in open fields is limited to those on bell pepper (Takeshita et al 2018, Urushibara et al 2013, lettuce (Ueta et al 2009), and sweet corn (Takeshita et al 2020, Takeshita et al 2019). This study is the first trial of growing onions with drip fertigation in Japan.…”

Section: ．Introductionmentioning

confidence: 99%

衛星システムと連動したドリップ・ファーティゲイションが北海道直播タマネギ収量に及ぼす効果：

TAKESHITA,

KUBO,

ONO

et al. 2023

Japanese Journal of Farm Work Research

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Direct seeding has become increasingly popular in an onion cultivation in the last decade, especially in Hokkaido. Although direct seeding can save time and costs of raising seedlings, onion farmers usually face three challenges. First, the germination rate of seeded onions is not good. Second, direct seeding makes it more difficult to control weeds than transplanting. Third, herbicides for weeds also cause damage to seeded small onions. It is vital to enhance the initial growth of seeded onions to solve these problems. The purpose of this study was to confirm whether drip irrigation/fertigation with a satellite system could enhance the initial growth of seeded onions and increase the yield in the actual commercial field of Hokkaido as an on-farm experiment. The results in 2021 showed that germination rate of drip fertigated plot was at 95%, while conventional cultivation plot was at 75%. We also confirmed that drip fertigation enhanced the initial growth. The yield of fertigated onions was 1.8 times greater than the yield by conventional cultivation. At the same time, we could decrease nitrogen fertilizer by 16% compared with the conventional value. Drip fertigation also increased the percentage of larger onion bulbs. The results also confirmed that the satellite image analysis was valid and useful to estimate the quantity of evapotranspiration and decide the amount of irrigation water. For these reasons, drip fertigation systems with satellite image analysis should be considered one of the best methods for direct seeding of onions.

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