How do you grow sweet corn?

　　Corn is a familiar crop widely cultivated in many regions. In rural areas, it is primarily grown as animal feed. However, there is now a type of corn whose main use is for human consumption—and it can even be eaten raw: super-sweet corn, also known as “fruit corn.” Below, let’s explore a comprehensive guide to fruit corn cultivation techniques.

　　 1. Site Selection and Land Preparation

　　The cultivation site should have fertile, well‑drained soil, ample sunlight, and convenient irrigation and drainage; care must be taken to prevent waterlogging, as this is essential for achieving high yields. Prior to sowing, apply sufficient base moisture, carry out meticulous rotary tillage, and level the field to ensure a smooth, fine surface with no exposed stubble or raised clods, thereby promoting uniform seedling emergence.

　　 2. Laying plastic mulch film

　　In areas where conditions permit, plastic mulching can be implemented. Mulching helps raise soil temperature, allowing for earlier sowing and earlier market availability of the product, while also reducing water evaporation, conserving soil moisture, and lowering production costs. Typically, the spacing between mulch strips is 100 cm, with ridge widths of 80 cm and ridge heights of 15 cm. The mulch film should be stretched taut and laid flat, with the edges securely sealed with soil.

　　 3. Sowing

　　Field planting is typically done around mid-March, while greenhouse cultivation allows for a more flexible schedule. Fruit corn comes in both early- and late-maturing varieties; on the same plot, you can stagger plantings to bring the crop to market gradually rather than all at once, which can be advantageous for maximizing returns. When sowing, place the seeds with the embryo facing downward and cover them with 1.5–2 cm of soil. Use compost or garden soil for covering, but avoid using large, coarse clumps to prevent hindering germination.

　　 4. Transplanting

　　Transplant seedlings promptly when they have developed two true leaves and a heart‑shaped cotyledon, or three true leaves and a heart‑shaped cotyledon. During transplanting, ensure that all plants are oriented with their leaves facing the same direction; this promotes adequate light penetration and air circulation, helping to prevent poor pollination. For spring planting, sow 2,800 plants per mu; for summer planting, 2,600 plants per mu; and for late‑autumn planting, 2,800 plants per mu.

　　 5. Fertilization

　　Based on the plant’s growth vigor, determine whether to apply a topdressing and, if so, how much fertilizer to use. Topdressing should be applied as a liquid fertilizer to ensure the plants can absorb it promptly. Typically, topdressing is carried out during intertillage (at the 5–6 leaf stage) or at the tasseling stage.

　　 6. Pests and Diseases

　　During the growth period of sweet corn, it is important to prevent and control diseases such as bacterial wilt and leaf spot. Disease management should prioritize prevention; apply fungicides 1–2 times before the rainy season or whenever field humidity is high. The primary pest is the European corn borer; monitor closely during tasseling and implement timely control measures upon detecting infestation.

　　 7. Harvest promptly

　　The sugar content of sweet corn kernels peaks during the milky stage after pollination; harvesting too early results in insufficient dry matter and reduced levels of various nutrients, leading to lower nutritional value and poorer flavor. Conversely, harvesting too late causes the pericarp to harden; although the ears become larger and yields increase, sugar content and taste decline. Generally, the optimal harvest time is around 25 days after pollination, when the kernels are fully in the milky stage, yielding the highest sweetness.

　　That concludes our overview of fruit corn cultivation techniques. With strong market demand for fruit corn, well‑managed crops can deliver substantial economic returns. To maximize yields, it is essential to pay close attention to key management practices throughout the growing process.