Hongmei Li is a high-yielding plum variety with an average fruit weight of 57 grams. It is an early-maturing type known for its excellent overall characteristics, making it highly suitable for commercial cultivation. To enhance productivity and quality, greenhouse cultivation is commonly used. Trees begin to bear fruit as early as the second year after planting. The fruits mature in mid-May, which is 30 to 40 days earlier than those grown in open fields. This early harvest significantly boosts economic returns. Below are the key techniques for managing greenhouse cultivation.
First, the structure of the winter-warm greenhouse plays a crucial role in ensuring optimal growing conditions. The greenhouse used is a modified string-type winter-warm structure. It has a span of 8 meters, a length of 60 meters, a ridge height of 3 meters, and a back wall height of 2.2 meters. The framework includes cement prefabricated central and front pillars for stability. The roof is covered with corn stalks, wheat straw, and other opaque materials to provide insulation. A non-drip film is selected for the greenhouse cover, and multiple layers of film are used to improve heat retention. After the film is properly installed, a 40 cm deep and 50 cm wide anti-freeze trench is dug around the front base of the greenhouse. This trench is filled with straw and compacted tightly, extending slightly above ground level to prevent cold air from entering. These measures help maintain a stable temperature inside the greenhouse, promoting faster growth and higher yields.
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