保蘖肥主要作用在于促进分蘖成穗,提高分蘖成穗率。据1985～1986年在新化县旱土小麦上的试验,在施足底肥、苗肥及施了穗肥的情况下,亩施2.5公斤纯氮做保蘖肥的,比不施保蘖肥成穗率高6.4％,每亩多4.8万穗,亩产量高61公斤,增产28.0％。1986～1987年试验,在底、苗、穗肥均施足的情况下,小麦施2.5公斤纯氮的保蘖肥比不施亩增2.64～4.62万穗,每亩增产41.7～54.7公斤,增产19.7～25.9％;大麦每亩增4.95万穗,亩增20.5公斤,增产13.7％。据试验的匡算,施保蘖肥每公斤尿素增产小麦9.95公斤,每投资1元增收12.66元。 Tillering fat main role is to promote tillering spike, increase tillering rate. According to the experiment from 1985 to 1986 on dryland wheat in Xinhua County, 2.5 kg of pure nitrogen was applied to make tillering fertilizer at the base fertilizer, seedling fertilizer and spike fertilizer, Spike rate of 6.4%, 48,000 spikes per acre, yield 61 kg high, an increase of 28.0%. From 1986 to 1987, the ratio of tillering fertilizer with 2.5 kg of pure nitrogen to wheat with no fertilizer application increased 2.64-4.62 million spike, yielding 41.7-54.7 kg per acre and yielding 19.7 ~ 25.9%; 4.95 million barley per acre increased, 20.5 kilograms by mu, an increase of 13.7%. According to the test calculation, Shi Bausheng urea yield per kilogram of wheat 9.95 kilograms of wheat, each invested 1 yuan income 12.66 yuan.