In winter and early spring, when the snow is about
to melt, wheat is susceptible to low-temperature
freezing damage (winter freezing damage, late spring
cold), and winter freezing damage has a greater
impact on yield than late spring cold.
1.Field management measures for winter wheat before winter
(1) Topdressing nitrogen fertilizers in time to promote
the growth of small tillers. For the first top dressing,
apply quick-acting nitrogen fertilizer in time after
thawing in the field, and apply 5-10kg/666.7m2 of urea
manually. The second time in the jointing period of wheat,
combined with watering and watering, jointing fertilizer
was applied, and 10-15kg/666.7m2 urea was applied.
Applying 15% triadimefon 100g/666.7m2 + carbendazim
150g/666.7m2 can promote the rapid growth of seedling
regeneration, and can also prevent the spread of snow
rot, snow mold and root rot.
(2) Generally, in frozen wheat fields, only the leaves
are frozen and withered, and there is no dead tiller
phenomenon. It should be hoeed in time in early spring
to increase the ground temperature and promote the
greening of the wheat seedlings. Topdressing and watering
during the rising period can increase the tillering rate.
Spraying brassin and potassium dihydrogen phosphate at
the seedling stage, heading and flowering stage, and
grain-filling stage can strengthen seedlings, enhance
disease resistance, make plants grow robustly, and
increase the number of effective panicles and thousand-grain
2.Spring field management measures for spring wheat
(1) The growth of overgrown wheat fields can be moderately
inhibited. The main measures are to spray Zhuangfengan,
Chlormetrodin and other inhibitors for chemical control
from the early spring rising period to the jointing period
to improve the cold resistance of wheat.
(2) Irrigation to reduce the variation of ground temperature and increase
soil temperature.3) Smoked. For local damage in a small area,
the smoke screen after the burning of the grass can
continue to increase the ground temperature. Generally,
the temperature can be increased by 1 to 2 °C, which has
the effect of reducing frost. However, special attention
should be paid to safety to prevent fire and environmental