Надо ли в обязательном порядке использовать на приусадебных участках минеральные удобрения? На этот счет мнение далеко не однозначное. Например, многие считают, что экологически чистые, а, значит, и полезные для организма овощи и фрукты можно получить, если вовсе отказаться от применения минеральных удобрений. Но так ли это?
Проведем простейшую аналогию с человеком. Например, многие из нас, следуя рекомендациям медиков, регулярно потребляют витамины, и, надо заметить, они химического происхождения. Делается это для того, чтобы обезопасить себя от различных заболеваний, недомогания, придать бодрости. Ведь наша пища не может дать нам весь необходимый набор витаминов. Так же и у растений. Как и человек, любое растение тоже отзовется на недостаток макро — и микроэлементов, выразив это «недовольство» своим внешним видом. Например, недостаток азота вызывает бледную окраску листа, от этого снижается качество и количество урожая. Теперь уже вы, собрав такой урожай, получите не обогащенные витаминами плоды, а балласт из клетчатки.
При недостатке основных элементов питания растений их корневая система разрастается в поисках таковых, и при этом идет недополучение продукции. Растение же, наоборот, начинает впитывать соединения, вредные для человека, и накапливать их в продуктовых органах: корнеплодах и плодах.
Да, минеральные удобрения — это прежде всего химические вещества. И безоглядное, неграмотное их применение может нанести вред. Не зря сегодня созданы и широко используются минеральные удобрения, рассчитанные на применение в определенный период роста растений и для конкретных культур. Таким образом, возрастает эффект от применения удобрений, уменьшаются дозы вносимых в почву химических веществ. На рынке специально для садоводов появились новые водорастворимые удобрения как импортного, так и отечественного производства.
Тем не менее, многие садоводы в отношении использования минеральных удобрений продолжают оставаться консерваторами. Кто-то считает, что в саду ему все заменит органика, кто-то надеется, что за долгие годы окультуривания его участок и так накопил в избытке питательных веществ. Но и те, и другие чаще всего ошибаются.
Надо подчеркнуть, что, используя только органические удобрения, невозможно обеспечить в полной мере минеральное питание растений. Например, минеральных элементов при внесении торфонавозного компоста в дозе 20 кг на квадратный метр будет внесено в почву лишь в следующих объемах: 4 г азота, фосфора -10 г, калия — 4 г (показатели средние). При этом вынос макроэлементов при выращивании, например, моркови за сезон доходит до 10-17 г на кв. метр по азоту, 5-8 г — по фосфору и 17- 25 г по калию. Так что судите сами, могут ли заменить органические удобрения минеральные. Те и другие в равной степени необходимы на участке.
Так использовать «минералку» в саду или нет? Выбор остается за вами. Но результаты научных работ, конкретные факты указывают на то, что и на садовом участке нам не обойтись без минеральных удобрений.
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