Для нормального роста и развития растения должны быть обеспечены суммой активных температур.
Этот показатель исчисляют как сумму среднесуточных температур воздуха за период с устойчивой температурой выше +10 ° С для теплолюбивых культур и +5 ° С для холодостойких.
Источник: supersadovod.ru
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