To test and amend soil in a winter greenhouse, start by using a soil testing kit to measure key factors such as pH, nitrogen, phosphorus, and potassium levels. This will help you understand the soil's nutrient content and whether it needs adjustment. If the pH is too high or low, you can amend it with lime to raise the pH or sulfur to lower it.
For nutrient deficiencies, incorporate compost, organic matter, or specific fertilizers tailored to the plants you're growing. If the soil is compacted, consider loosening it with a garden fork or adding perlite or sand to improve drainage and aeration. During the winter months, it's important to avoid overworking the soil when it's too wet, as this can lead to compaction. To keep the soil healthy, regularly replenish organic matter to maintain its fertility and structure.
