Seedling raising technique of Robinia pseudoacacia

(1)Thinning locust seedlings like light, differentiation early, such as seedling density is too large, differentiation is more obvious, so to timely thinning seedlings. The first thinning is carried out when the seedlings are 3-4cm high, and the weak seedlings are removed. After that, according to the growth and density of seedlings, the seedlings are thinned for 1-2 times. 12-15 seedlings should be reserved for each meter long. 12 - 15 000 seedlings per 667m2 were suitable.

(2)Watering, topdressing locust seedlings do not water before emergence, so as not to make topsoil hardening, resulting in uneven emergence. After emergence, water properly and keep the soil moist. Kuandian area can be watered 3-5 times a year. Watering should be appropriate, Robinia pseudoacacia afraid of waterlogging, rainy season to timely drainage, prevent seedling root rot.

A topdressing at seedling stage is carried out in the first and middle of July. Ammonium sulfate 15- 20kg per 667m2, watering once after fertilization, stopping topdressing and watering in late July to prevent excessive growth of seedlings and affect seedling lignification.

(3)The soil should be kept loose and free of weeds. In the first half period of seedling growth, loosen soil and weed every half month or so, and in the second half period of seedling growth, loosen soil and weed every 30 days, generally after watering and rain.

(4)Control of diseases and insect pests Robinia pseudoacacia seedlings easy to occur blight, when the seedlings are fully sprayed once every 15 days equivalent Bordeaux mixture or spray 1%~2% ferrous sulfate solution for control. 6-7 Aphids occur monthly harm, available 40% dimethoate 0.05% solution spraying control.

(5)Robinia pseudoacacia seedlings grow fast, dense branches and leaves, high requirements for light and ventilation conditions, and serious seedling differentiation, rapid growth and development of large seedlings suppress the growth of surrounding seedlings. Therefore, the method of cutting shoots and beating leaves was adopted to inhibit the growth of large seedlings and assist the growth of small seedlings, so as to make them grow and develop in a balanced manner and achieve the goal of high quality and high yield. Cutting and leafing were carried out in summer when seedlings grew vigorously and luxuriant, generally starting from seedling height of 60- 70cm, and then every 20 days, ending in mid-August. To cut branches and leaves upward from both sides of the ridge, cut more large seedlings, cut less medium seedlings, and not cut seedlings. The height of seedlings after cutting is not shorter than 50cm. Such as seedlings are not too dense, seedlings differentiation is not serious, you can not beat leaves.