Hongmei Li is a highly productive plum variety with an average fruit weight of 57 grams. It is an early-maturing type known for its excellent overall characteristics, making it a popular choice among growers. To enhance its growth and yield, conservation techniques are commonly used to promote cultivation. The first harvest typically occurs in the second year after planting. The fruits mature in mid-May, and their ripening period is 30 to 40 days earlier compared to those grown in open fields, which significantly improves economic returns. Below is an introduction to the greenhouse cultivation techniques used for this variety.
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 greenhouse, with 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. It features cement prefabricated central and front pillars for structural support. The roof is covered with corn stalks, wheat straw, and other opaque materials to provide insulation and maintain temperature. A drop-free plastic film is selected as the outer covering, and the space between the films is properly sealed to prevent heat loss. After the film is installed, a 40-centimeter-deep and 50-centimeter-wide anti-cold ditch is dug around the front base of the greenhouse. This ditch is filled with straw and then compacted to ensure it remains above ground level, providing additional insulation and protecting the plants from cold damage during the winter months. These measures help create a stable and favorable environment for the early maturation and high yield of Hongmei Li plums.
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