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Hybrid Rice Production Technique Market
**Three-Word Hybrid Rice Seed Production Technology: A Comprehensive Guide**
Source: Seed Technology
Category: Technical Articles
Update Time: 2008-12-16 17:15:49
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This article introduces a three-word hybrid rice seed production technology, focusing on scientific water management and flowering prediction techniques. The method includes four key stages of irrigation, as well as detailed strategies for managing the growth cycle of rice plants to ensure high-quality seed production.
### 4. Scientific Water Management Techniques
#### 4.1 Shallow Water Irrigation Period
During the tillering stage, shallow water should be maintained to create a stable temperature and humidity environment for seedlings. This promotes early root development and faster greening. Shallow irrigation also helps increase soil and water temperatures, creating a larger day-night temperature difference, which encourages early tiller formation and increases the number of tillers per plant.
#### 4.2 Wet (Dry, Sun) Field Period
From the end of panicle initiation to the beginning of young panicle differentiation, it is recommended to drain the field slightly to improve tiller and spike percentage while suppressing unwanted tillers. In fields with deep mud or high fertility, sun-drying can enhance soil properties and promote root development, improving plant resistance to lodging. Intermittent irrigation during the grain-filling period helps maintain leaf function, ensuring strong photosynthesis and reducing empty grains.
#### 4.3 Deep Water Irrigation
During the seedling and booting stages, especially heading and flowering, deep water irrigation is essential to meet physiological and ecological needs. In hot summer months, deep water can reduce temperature by about 0.5°C, helping to mitigate heat stress and improve pollination success.
### 5. Flowering Prediction Techniques
#### 5.1 Four-Leaf Prediction Method
The four-leaf stage is crucial for predicting the heading period. If seedlings are healthy, the main stem will have fewer leaves, shortening the sowing period and leading to an earlier heading. Otherwise, the process may be delayed.
#### 5.2 Nutrition Period Prediction
The duration of the vegetative period influences heading time. Good growing conditions can accelerate development, while dense planting and poor management may delay it. However, this rule applies mainly to the vegetative phase and not to reproductive stages.
#### 5.3 Inverted Four-Leaf Prediction
By observing the inverted five-leaf stage and using a microscope, growers can estimate whether the stem has entered the inverted four-leaf stage. Combining this with leaf age and growth rate allows accurate prediction of the flowering period using regression equations.
### 6. Mastering the “Three Easy†and “Three Difficult†Techniques
#### 6.1 Understanding the “Three Easy†and “Three Difficult†Adjustments
Early adjustments are easier, while late ones are more challenging. Adjustments made during the young panicle differentiation period are limited in effectiveness. Delayed heading is difficult to reverse, and adjusting the mother parent is often costly due to its sensitivity.
#### 6.2 Main Adjustment Techniques
Agronomic practices such as cutting heads and controlling fertilization can influence heading time. Fertilizer and water management, including nitrogen control and potassium promotion, can either delay or accelerate flowering. Hormone regulation, like using paclobutrazol, can also help adjust the timing of heading.
### 7. Pest and Disease Control
#### 7.1 Seed Disinfection
Disinfecting seeds before planting is critical to prevent diseases like rice bakanae, blast, and bacterial blight. Proper disinfectant concentration and timing significantly reduce disease incidence.
#### 7.2 Integrated Pest Management
Prevention and timely treatment of pests and diseases are essential. Monitoring weather conditions and applying pesticides at the right time ensures effective control and minimizes crop damage.
### 8. Application of 920 Technology
#### 8.1 Timely Spraying
Spraying 920 should be done based on the sensitivity of the parents. For example, V20A should be sprayed when 5–10% of the flowers are open, while T98A requires 25–30%.
#### 8.2 Appropriate Dosage
The amount of 920 applied per acre varies depending on the variety. It is usually split into two applications, with the first being 30% of the total dose and the second 70%.
#### 8.3 Spraying Technique
Weather conditions and flowering progress must be considered. Spraying should be done in the morning or after 4 PM on sunny days, and adjusted accordingly for rain or wind.
### 9. Ensuring Seed Purity
#### 9.1 Strict Isolation
To avoid cross-pollination, natural barriers, spatial separation, or temporal differences in flowering periods are used to isolate different rice varieties.
#### 9.2 Impurity Removal
Impurities should be removed during the heading period, including mutant strains and non-hybrid plants. Careful inspection ensures only pure seeds are retained.
#### 9.3 Standardized Operations
All steps from collection to packaging must be carefully managed to prevent contamination and ensure seed quality.
### 10. Ensuring Seed Quality
#### 10.1 Post-Flowering Management
Proper fertilizer and water management, along with timely pesticide use, helps prevent lodging and disease. Harvesting should occur when seeds are 80% mature to avoid rain damage.
#### 10.2 Optimal Harvesting Time
Harvesting should be scheduled according to weather forecasts, using manual or mechanical methods to ensure clean, high-quality seeds.
#### 10.3 Drying After Rain
If rain occurs after harvest, seeds must be dried promptly using proper methods such as bamboo drying or low-temperature drying to reduce moisture and preserve seed viability.
This comprehensive guide provides practical insights into hybrid rice seed production, emphasizing the importance of scientific management, timely interventions, and quality control to achieve successful outcomes.