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Strategies for improved management of fresh market spinach

Date:
September 16, 2013
Source:
American Society for Horticultural Science
Summary:
To provide California's spinach growers with new management strategies for nitrogen fertilizer and irrigation practices, researchers performed experiments in the Salinas and San Juan Valleys of California. They determined that, to mitigate environmentally negative nitrogen losses, the nitrogen use efficiency can be increased by the use of soil testing at two critical points: at-planting and before the first midseason fertilizer application.

Fresh spinach is a high-production, high-value crop.
Credit: teleginatania / Fotolia

Throughout California's fertile central coast region, fresh spinach is a high-production, high-value crop. Spinach can be finicky, requiring sufficient nitrogen fertilizer and irrigation to ensure ideal growth, and to meet industry quality standards such as its defining deep green color. These production practices--combined with a shallow root system and the crop's intensive production cycle--can increase the potential of detrimental nitrate leaching. Recent water quality monitoring in the region has found widespread incidents of NO3 levels that exceed the Federal Drinking Water standard. As a result, growers have come under increasing pressure to improve crop nutrient use efficiency (NUE), and thereby minimize NO3 losses from production fields. In an effort to inform future spinach production practices, scientists Aaron Heinrich, Richard Smith, and Michael Cahn evaluated spinach nutrient uptake and water use in the Salinas and San Juan Valleys of California.

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The team explained that spinach producers can improve nitrogen use efficiency by applying fertilizer at the optimal time and rate to match crop nitrogen uptake, but that data needed to make these critical fertilizer decisions was not available prior to their study. "No studies had evaluated high-density planting of clipped or bunched spinach grown on 80-inch beds," said lead author Aaron Heinrich. "Our study was specifically designed to provide data on the nitrogen uptake characteristics of spinach and to evaluate ways to improve nitrogen fertilizer management."

Heinrich, Smith, and Cahn evaluated grower fertilizer programs, and measured spinach nitrogen uptake over an entire production season with a range of soil conditions, climatic conditions, and cropping histories. They also conducted four replicated fertilizer trials of first- and second-cropped fields.

"Over the growing season, NO3 levels in the soil can build up due to a combination of unused fertilizer and mineralization of crop residue and soil organic matter," the team reported "Our evaluations showed that soil NO3 testing can be used to improve the nutrient use efficiency of spinach. We found that soil testing would be most effective in spinach production at two critical points: at-planting, and before the midseason fertilizer application when nitrogen use by spinach greatly increases." The comprehensive report, including additional implications for nitrogen fertilizer management of fresh market spinach, can be found in the June 2013 issue of HortTechnology.


Story Source:

The above story is based on materials provided by American Society for Horticultural Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Aaron Heinrich, Richard Smith, And Michael Cahn. Nutrient and Water Use of Fresh Market Spinach. HortTechnology, June 2013

Cite This Page:

American Society for Horticultural Science. "Strategies for improved management of fresh market spinach." ScienceDaily. ScienceDaily, 16 September 2013. <www.sciencedaily.com/releases/2013/09/130916103650.htm>.
American Society for Horticultural Science. (2013, September 16). Strategies for improved management of fresh market spinach. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2013/09/130916103650.htm
American Society for Horticultural Science. "Strategies for improved management of fresh market spinach." ScienceDaily. www.sciencedaily.com/releases/2013/09/130916103650.htm (accessed October 25, 2014).

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