Using milk as fertilizer has been an old-time remedy in the garden for many generations. Some gardeners add milk to their compost piles.
Like us, plants use calcium for growth. A lack of calcium is indicated when plants look stunted and don’t grow to their full potential. Blossom end rot, which is commonly seen in squash, tomatoes and peppers, is caused by a calcium deficiency.
Feeding plants with milk ensures they will get enough moisture and calcium. However, there are drawbacks:
1) The benign fungal organisms that colonize leaves and break down milk can be aesthetically unattractive.
2) Dried skim milk has been reported to induce black rot, soft rot, and Alternaria leaf spot on treated cruciferous crops.
3) Mycobacterium bovis and Mycobacterium tuberculosis were historically a common source of tuberculosis. Both of these organisms are destroyed by pasteurization.
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