Luoping County has a vast corn planting area of 280,000 mu, requiring 840 tons of hybrid corn seeds annually. However, in 2006, the county only managed to produce 2,000 mu of crops, with an average yield of 160 kg per mu, resulting in an annual output of over 300 tons of hybrid seeds. This left a significant gap of more than 500 tons, highlighting a critical shortage of quality seeds for farmers.
Located in the low-heat valley area of Luoping County, Depei Village enjoys a favorable climate with an average annual temperature of 16°C, 1,319.5 mm of rainfall, and over 1,800 hours of sunshine. The region is humid, warm, and well-irrigated, making it ideal for seed production. However, challenges such as difficulties in selecting isolation zones and harvesting during rainy seasons have led to delays in seed storage and a major impact on marketing. As a result, the demand for maize hybrid seeds in the area remains high.
To address this issue, Luo Pingxian Seed Company initiated spring seed production trials in Depei Village in 1995, which proved successful. By the end of 2006, the total area under spring propagation exceeded 3,000 acres, with an average yield of 120 kg per mu. This approach not only improved seed supply but also boosted local agricultural productivity.
The spring multi-cropping seed production technology used in Depei focuses on time isolation, reducing cross-pollination and ensuring high seed purity. Early harvests allow for quicker market entry, lowering costs and maximizing the use of idle land. This method has opened new opportunities for increasing both crop yields and farmer incomes.
Before sowing, sunning the seeds helps improve germination rates and ensures uniform sprouting. Parent seeds are exposed to sunlight for 1–2 days before planting. A reasonable ratio between male and female parents is crucial for maximizing seed setting. Depending on pollen viability, the ratio can be adjusted to 6:1, 5:1, or 4:1 to optimize pollination success.
For the male parent, three stages of sowing at intervals of 5–7 days ensure a continuous supply of pollen throughout the season. This strategy supports better pollination and higher seed yield.
High-yield cultivation techniques involve selecting suitable land with good drainage and irrigation. Fields should be level, with fine soil and straight ditches for efficient water management. Sowing is done according to the growth cycle of the parents, typically late February to early March, with plastic film covering to retain warmth and moisture.
Field management includes timely removal of the plastic film after emergence, thinning seedlings to 3–4 leaves, and proper fertilization and cultivation. Female plants require careful attention to ear development and emasculation, while male plants need support for strong pollen production.
To control pests like the small tiger beetle, which thrives in dry and cold conditions, preventive measures such as spring plowing and organic insecticide application are essential. In areas prone to infestation, early weed removal and pesticide treatment help reduce damage.
Flower forecasting and adjustment are key to ensuring synchronized flowering. If weather conditions alter the growth cycle, adjustments must be made—such as controlling growth for fast-growing parents and promoting growth for slower ones. During the flowering period, timely emasculation of female plants and manual pollination enhance seed purity and yield.
Strict parent selection is vital. Before sowing, inferior seeds are removed, and uniform seedlings are kept. During the flowering stage, any off-type plants are eliminated to maintain genetic integrity. After flowering, male plants are cut to prevent unwanted pollination.
Emasculation of the female parent is critical. It must be done thoroughly before the tassel emerges, removing any loose-pollinated strains within a 5-meter radius. This ensures clean and pure seed production.
Harvesting should occur promptly once the corn is mature, typically from late June to early July. Post-harvest, mixed or diseased ears are removed to prevent mold and maintain seed quality. Proper storage and handling are necessary to avoid contamination and mechanical mixing.
Luoping Datian Seed Company continues to lead in hybrid seed production, employing advanced techniques to meet the growing demand and support local agriculture. Their efforts have significantly contributed to improving seed quality and sustainability in the region.
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