What is the jointing stage of wheat turning green? What's the significance in production?

Wheat turning green is a phenomenon and process that wheat resumes growth after wintering. The sign of turning green is that more than 50% of the heart leaves in the field turn green, and the period of growing 1 ~ 2 cm is the green period. Wheat leaves in northern winter wheat areas wither and turn yellow in winter, turn green in early spring, and the turning green period is obvious. Wheat overwinters in green in southern wheat areas, and there is no obvious turning green period. The main contradiction of wheat growth in the turning green period is low temperature. Therefore, measures should be taken to keep the soil moisture and increase the ground temperature, and irrigation is generally not needed to prevent the ground temperature from decreasing after irrigation, which is particularly important in the northern wheat area.

Jointing is a phenomenon and process of wheat internode elongation. Internode elongation is carried out in a certain order from bottom to top, and adjacent internodes have a period of synchronous growth. The elongation of the first internode at the base of the main stem began to enter the jointing stage. When the elongation of the first internode of the main stem in the whole field is more than 50% 1.5 ~ 2 cm, it can be said that it has entered the jointing stage. The sequence and process of jointing are as follows: when the first internode of the base is rapidly elongated, the second internode begins to slowly elongate, and the third internode hardly elongates; After the first internode elongation is completed (fixed length), the second internode elongates rapidly, the third internode begins to elongate slowly, and the fourth internode hardly elongates, and so on. From the beginning of jointing stage to the basic end of jointing stage, it is called jointing stage The jointing stage is a period when the vegetative growth and reproductive growth of wheat go hand in hand, and the growth and development are extremely vigorous, and it is also a critical period when fertilizer and water are needed. Therefore, management should be strengthened according to soil fertility and water content in production, and timely irrigation and fertilization should be carried out to promote wheat growth and strive for high yield.