The total area of pear cultivation in the country is 1,074 million hectares, with a total output of 1,4262,000 tons, representing approximately 72 per cent and 65 per cent of the world's pear cultivation and production, respectively. Although my country is a major producer of pears, it is not a strong producer. The salient issues are, first, the irrational structure of the varieties and their ageing. The percentages of pears, duck pears, pears, pears are too high and market prices are low. Second, the upgrading of varieties has been slow, and high-change technologies have lagged behind. The traditional high-change method uses the main branches to fall off. The slow recovery of the tree canopy and the failure to establish the growth balance that has been broken by the high modifications have often led to the occurrence of high-change diseases, seriously affecting the efficiency of the restructuring of our pear varieties. High-intersection technology is an operational, first-reading, first-reading, high-college, fast-recovered, operational and efficient new technology for pear planting。
The zhengzhou fruit tree institute of the chinese academy of agricultural sciences and the pear technology research centre of nanjing university of agriculture have developed new technologies for the exchange of pear tree heights from the main branch (dry) piercing + small twigs。
Technical elements:
1. Retain the centre's trunks on the basis of the original number of branches 3-5, and leave a short length of 1. 5 to 2 metres for the main branches (dry) that have been retained, and transform the original tree into a high-luminous tree of dry columns in the main branches of the base。
Ii. For long-lived bald branches (dry), a sprouts can easily be inserted through a hole in the lurch, thereby filling the gaps in the tree crown。
Iii. Shortness of 1 to 2 cm in diameter on the leftover main branch (dry) as of 8-10 centimetres for inbreeding, more than 20 ears are usually contracted on the main branch (dry), and 100 to 200 ears are contracted on a tree born 20 to 40 years old. The tree canopy could be restored in that year, the second year could result in a return to production in the third year。
The expansion of more than 1 million acres in major pear-producing areas such as hebei, anhui, henan, jiangsu, shandong, hubei, hebei, liaoning and sichuan provinces has effectively reduced the proportion of traditional (or local) varieties and old varieties and contributed to the restructuring of pear varieties. The current structure of early, medium and late-literate varieties is approximately 55:25:20, which is relatively reasonable。
