Effect of Planting Density on Dry Matter Production of Spinach for Processing

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  • Kamada Erika
    Kyushu Okinawa Agricultural Research Center, NARO Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Ishii Takanori
    Kyushu Okinawa Agricultural Research Center, NARO
  • Ozaki Yukio
    Faculty of Agriculture, Kyushu University

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  • 栽植密度が加工・業務用ホウレンソウ群落の乾物生産に及ぼす影響
  • サイショクミツド ガ カコウ ・ ギョウムヨウ ホウレンソウ グンラク ノ カンブツ セイサン ニ オヨボス エイキョウ

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<p>The effect of planting density on dry matter production was investigated in the cultivation of spinach for processing, which is grown more sparsely than for fresh use. Dry matter production was analyzed based on the fraction of radiation intercepted (fi-SR), amount of radiation intercepted (DIR), and radiation use efficiency (RUE) of a spinach canopy grown at a row spacing of 30, 35, or 40 cm and a plant spacing of 5 or 10 cm. The light absorption coefficient, representing the relationship between fi-SR and the leaf area index (LAI), did not differ depending on the planting density, and LAI determined DIR. Although there was no significant difference of RUE by planting density in 2021, the value with the 10 cm planting interval was significantly higher than that with the 5 cm due to late snowing and a rapid decline in the temperature. Dry weight per unit ground area was significantly higher with the 5 cm plant spacing than with the 10 cm spacing during growth. However, no significant difference was observed at harvest. Until fi-SR was saturated, a higher dry weight yield depended on the high DIR caused by the increase in LAI arising from dense planting. After fi-SR became saturated, the increase in dry matter depended on RUE, and the difference in dry matter accumulation became relatively small. A spacing of approximately 10 cm between plants could produce spinach with traits suitable for processing and commercial use while maintaining a yield equivalent to that of dense planting with a spacing of approximately 5 cm.</p>

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