What kind of fertilizer should be applied to plum trees before blooming?

Before the plum tree blossoms, 25 kilograms of ammonium bicarbonate and potassium dihydrogen phosphate are applied per mu to promote plum blossom and fruit setting. From young fruit stage to mature stage, 25 kg of urea, diammonium phosphate and potassium sulfate were applied per mu. After the fruit was harvested, 50 kg urea was applied per mu. In September, 3000 kg of high-quality crude fertilizer, 30 kg of diammonium phosphate, 30 kg of potassium sulfate and 30 kg of urea were applied per mu.

First, how to prune the plum tree?

Generally, it can be carried out 3-5 times. After sprouting in spring for the first time, the main purpose is to erase the improper buds and the weak buds in the double buds and reduce the ineffective branches. The second time is after falling flowers, thinning off the dense branches to control the competitive branches. For the third time, the branches were truncated after the hard core. For the fourth time, in the early and late autumn, the superfluous secondary shoots were cut short or thinned, and the long fruit branches were coring.

Second, how to protect the plum tree from cold?

In the case of no frost injury in winter, generally do not overwinter indoors, let it hibernate naturally outside. If frost damage occurs, you can choose sunny weather to pour water once before the soil is frozen, wrap the whole container with a straw bag after the water seeps, tie it tightly with a rope, or dig a ditch to bury it in the leeward direction.