What are the effects of rice seeder sowing speed on sowing accuracy

Seeding speed refers to the forward speed of the seeder during operation, usually in kilometers per hour (km/h) or meters per second (m/s). The speed is determined by factors such as the tractor's driving speed, the seeding frequency of the rice seeder, and the flatness of the ground. The operator can adjust the tractor's travel speed through the transmission, or control the transmission ratio of the seeding device speed and the seeding shaft to achieve seeding operations at different seeding speeds.

Main technical indicators affecting seeding accuracy
Seeding accuracy is generally measured by the following technical indicators: consistency of plant spacing, consistency of row spacing, missed seeding rate, reseeding rate, consistency of seeding depth, seed breakage rate, etc. These parameters not only affect the emergence rate and plant uniformity, but are also directly related to the final yield and mechanized management efficiency.

Negative impact of high seeding speed on seeding accuracy
Seeding delay and uneven plant spacing
At high seeding speeds, the time lag from the seeding device to the soil and the lengthening of the seed parabolic motion trajectory cause the actual landing point to shift, which can easily cause uneven plant spacing. Especially when the mechanical seed wheel rotates at high speed, the seed spacing is difficult to control stably, and the distribution between plants is irregular.
Increased missed seeding rate
The seed meter is unstable at high speed, especially in the air-suction seeder. Insufficient adsorption of seeds or displacement of adsorption position can easily cause no seeds to be placed in some acupoints, and the missed seeding rate increases significantly.
Increased reseeding rate
Due to the influence of inertial force and vibration force during seed transmission, the seed meter may release two or more seeds continuously during high-speed movement, resulting in seed aggregation and increased reseeding rate, affecting seedling ventilation and later tillering space.
Fluctuation of sowing depth
As the sowing speed increases, the contact stability between the sowing mechanism and the ground decreases, and the sowing depth control device is difficult to respond to the undulation of the ground in time, resulting in different sowing depths, which in turn affects the germination rate and uniformity of the seeds.

The efficiency cost of low sowing speed
Although low-speed sowing is conducive to improving sowing accuracy, it also brings about the problem of reduced operating efficiency. The area of ​​work completed per unit time is reduced, and the cost of agricultural machinery use increases. At the same time, it increases the working time and fuel consumption of operators to a certain extent. Therefore, how to find the optimal balance between sowing accuracy and operating efficiency is a hot topic in the current research of rice seeder design and scheduling.

Importance of matching between sowing speed and sowing system
In order to adapt to different sowing speed conditions, modern seeders should have good dynamic response capabilities of the sowing system. For example, the use of an electronically controlled drive sowing system can monitor and adjust the sowing frequency in real time to achieve dynamic matching with the forward speed. Some intelligent sowing equipment is equipped with GPS positioning and speed sensors to automatically adjust the sowing rate according to speed changes to ensure stable plant spacing.

Practical application suggestions for sowing speed optimization
In actual operations, it is recommended that operators determine the appropriate operating speed based on the type of seeder, soil conditions, seed characteristics and operating requirements. In general, it is more reasonable to control the rice sowing speed between 3 and 5 km/h, which can take into account both operating efficiency and sowing accuracy. In high-speed operation scenarios, precision sowing machines with electronic monitoring and automatic speed regulation functions should be given priority to reduce sowing errors.