After the delayed tomato planting in autumn, vegetable farmers reported that the seedlings did not grow after planting. The seedlings sent at that time grew neatly in the plug trays, and the leaves were dark green, but after the planting, small and large seedlings appeared and grew. It is very irregular, and some plants are even different in height by 15-20 cm. Especially some plants that grow weaker, under the current environmental conditions, the longer they become weaker, and eventually they even wilt and die. What is the reason for this?
Cause Analysis
The growth of newly planted seedlings is uneven, mainly due to poor root growth, which has a lot to do with soil problems and improper cultivation management.
In the old sheds that have been planted for many years, the soil is often compacted and more salinized, and the buffering capacity is reduced. After the seedlings are planted, the root system is difficult to pierce, and it is easy to be injured when suspended on the ground. In addition, the tomato with delayed cropping in autumn requires a large amount of base fertilizer. , Once the fertilizer is applied late and the maturity is not complete, it will easily cause root burning, affect the slow seedling, and aggravate the uneven height of the seedlings.
In addition, after the seedlings are planted, the vegetable growers adopt the method of watering frequently in order to slow down the seedlings quickly, or control the water for a long time in order to control the lengthening, which has laid a bad foundation for the weak root system. Watering too often, the permeability of the soil is poor, the natural growth of new roots is low, and even the original old roots turn yellow, brown and die due to poor ventilation. Excessive water control will result in insufficient water and nutrient support from the root system, which will naturally lead to malnutrition.
Mitigation measures
Strike and hoe frequently: Weak seedlings should be hoeed frequently to improve the permeability of the soil and promote deep piercing of the root system, and hoe every 3 to 5 days. After watering, the surface of the soil is hardened and the air permeability is greatly reduced. You should also hoe in time after each watering. But pay attention to the depth of the hoe, so as not to damage the root system of the seedlings. Generally, the depth of the hoe is 3~5 cm.
Strengthen management of weak trees: For weak trees, root irrigation or flushing of rooting agents should be adopted to promote rooting, such as seaweed extract, amino acids, humic acid, chitin, beneficial bacteria and other rooting fertilizers to promote the roots of weaker seedlings Growth, reduce root damage, improve the growth of shorter seedlings, narrow the gap between height and short, so that we can manage the neat and consistent seedlings.
Control the early and late fruit retention: Weak trees should retain fruit late, and the early stage is mainly to promote growth. The higher growth plants should be properly controlled, and the fruit should be retained early, and the fruit will fall, and the plant growth should be coordinated to the maximum limit. , To promote consistent growth.
Increase the use of decomposed organic fertilizer after changing the stubble: in the old shed that has been planted for many years, before planting the next stubble of vegetables, the soil should be deep-turned, and the depth can reach 35 to 40 cm. The applied organic fertilizer can be fermented and decomposed manure or commercial organic fertilizer, which can alleviate hardened and saline soil.
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