Variations in climatic suitability and planting regionalization for potato in northern China under climate change.

PLoS One · 2018 · PMC6159864 · PMID 30260968

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an increasing trendno p-value reported

During the potato growing seasons (April-September) from 1965 to 2014, the average light suitability index of the potato showed an increasing trend, increasing 0.014 every ten years.The maximum value of light suitability index was found in 2013 (0.891), and the minimum value was found in 1995 (0.679).

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a slightly increasing trendno p-value reported

Overall, the C value over the past 50 years showed a slightly increasing trend during the whole growth season, benefitting potato growth in northern China.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.