What does thinning out seedlings mean? When is it generally done?

Summary Crops sown in the open field need to be thinned twice. The first time is after the seedlings have all emerged, keeping 2-3 seedlings per cluster and pulling out the excess seedlings according to a certain spacing between plants and rows; the second thinning, also called final thinning, is done when the seedlings have grown to 3-4 true leaves. When crop seeds emerge, the use of artificial methods such as manual, mechanical and chemical means to remove excess seedlings is called thinning.

1. When is thinning generally done

1. Flowers sown in the open field generally need to be thinned twice. The first time is after the seedlings have all emerged, keeping 2-3 seedlings per cluster and pulling out the excess seedlings according to a certain spacing between plants and rows; the second thinning, also called final thinning, is done when the seedlings have grown to 3-4 true leaves. Apart from flowers and plants that are generally to be planted in clumps, on average 1 strong seedling is kept, and the flower seedlings removed by thinning can be used to fill gaps where plants are missing.

2. For a small number of flowers tolerant of transplanting, they can also be planted into other nursery beds. Generally, watering should be done promptly after thinning, to prevent the seedlings that were loosened during thinning from drying out and dying. Reasonable close planting means appropriately increasing the planting density on the premise of not affecting the yield of a single plant, or of a single plant achieving a certain yield.

3. Generally, reasonable close planting can coordinate the relationship among the three factors of number of ears, number of grains and grain weight. Close planting helps increase the number of plants per hectare, ensuring a certain number of effective ears per unit area. Under certain conditions, reasonable close planting combined with appropriate planting measures can keep individual development less affected, allow population development and individual development to develop in a coordinated way, and make the product of the three factors that constitute yield reach a relatively large value, thereby obtaining a relatively high yield.

4. Because under certain conditions, after the density exceeds a certain range, once the leaf area grows to a certain limit, it will cause shading in the field, leading to insufficient light between plants, and the yield will instead not be very high. The number of grains per ear decreases as the density increases, the 1000-grain weight also decreases somewhat, the ear is liable to become shorter, the ear stem becomes thinner, the degree of bald tip increases somewhat, and the grain yield begins to decline.

2. What does thinning out seedlings mean

1. Thinning out seedlings is also called thinning. Generally, for sowing in protected cultivation as well as sowing in the open field, the sowing rate exceeds the number of seedlings to be retained, causing the seedlings to be crowded. To ensure that the seedlings have sufficient growing space and nutrient area, a small number of seedlings need to be pulled out promptly, and then strong seedlings are selected and retained, promoting air circulation and sufficient sunlight among the seedlings. Generally, timely thinning and final thinning can prevent the seedlings from being crowded and shading each other, save soil moisture and nutrients, and help cultivate sturdy seedlings.

2. When crop seeds emerge, the use of artificial methods such as manual, mechanical and chemical means to remove excess seedlings is called thinning. After the excess seedlings are removed, once the number of seedlings retained in the field reaches the required number of seedlings, there is no need to remove excess seedlings anymore.

3. At the same time, when the number of crop seedlings in the field is basically stable, it is called final thinning. So thinning has broad and narrow meanings. Thinning refers to removing unwanted crop seedlings, mainly removing unwanted seedlings. Thinning and final thinning are two aspects of the same operation, while final thinning refers to keeping the needed crop seedlings, mainly retaining seedlings.