Seed rate (Too low) - IRRI Rice Knowledge Bank (2024)

FAQs

Seed rate (Too low) - IRRI Rice Knowledge Bank? ›

When seeding rate is too low, plants have low crop stand, low ground cover, and they experience greater weed pressure.

With precise seed-metering planters, DSR crop is planted with a lower seed rate (15-20 kg ha-1) and more precise plant-to-plant spacing.

In rabi, seed can be sown from September to December or January, depending on the time of rice harvest and availability of irrigation. Seed Rate: The seed rate is 25-30 kg/ha for spring or summer and 15-20 kg/ha for kharif and rabi.

Seed rates are typically adequate between 40 to 100 kg per ha.

The seed with physical quality should have uniform size, weight, and colour and should be free from stones, debris, and dust, leafs, twigs, stems, flowers, fruit well without other crop seeds and inert material. It also should be devoid of shriveled, diseased mottled, moulded, discoloured, damaged and empty seeds.

Calculate seeding rate adjustments for germination by dividing the desired seeding rate (seeds/ft2) or (lbs/acre) by the percent germination. Examples: a. 35 seeds/ft2 divided by 85% germination = 41.2 seeds/ft2.

Low seed rates can occur due to uneven distribution or insufficient seed used. Crops can be surface-broadcasted (wet or dry), drill-seeded (using machines) or broadcasted and incorporated when sown on dry fields. Pre-germinated seed is typically used in wet direct seeding.

For conservation purposes, seeding rates have been established to achieve the desired plant density of around 20-60 live seeds per square foot. These figures are fairly standard when figuring seeding rates except when you are dealing with very large or very small seed sizes (e.g. eastern gamagrass vs. bermudagrass).

Similarly, when comparing two seed values, the seed value closer to one is referred to as the higher seed, while the other seed is the lower seed. Higher seed values are assigned to better teams, as decided by the selection committee.

Dividing this by 1,000 gives you a total area of about 43.56 (rounding up for simplicity). Using our example seeding rate of four pounds per 1,000 square feet and scaling it up to one acre (43.56 thousand square feet), you would need approximately 174.24 pounds of seed to cover that entire area.

How do you tell if a seed is good? ›

One method to check for seed viability is the water test. Take the seeds and place them in a container of water. Let the seeds sit for 15 minutes. If the seeds sink, they are still viable; if they float, discard, because they probably will not sprout.

Good seed is pure (of the chosen variety), full and uniform in size, viable (more than 80% germination with good seedling vigor), and free of weed seeds, seed-borne diseases, pathogens, insects or other matter. Seed should be properly labeled.

High quality seeds are the result of good production practices, which include: proper maintenance of genetic purity • good growing conditions • proper timing and methods of harvesting • appropriate processing during threshing, cleaning and drying • appropriate seed storage and seed distribution systems.

Sowing rate (kg/ha) = target plant population (p/m2) x TGW (g) x 100. % germination x % emergence.

The grains per panicle are usually divided into two categories, one is full grain and the other is empty grain. Among them, full grain is the real measure of the number of grains per panicle, and the ratio of full grain to the total number of grains per panicle is called the seed setting rate.

Plant Materials Technical Note. Background. The amount of seed planted across the landscape is known as the seeding rate. Proper seeding rates are essential in conservation planting stand establishments.