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一、问题的提出与经过美国著名土壤科学家Truog也是测土施肥科学创始人之一,他于1960年第七次国际土壤学会上做了题为“测土工作五十年”的报告。他对测土施肥研究十分重视,并提出其独创的观念与方法,其要点是:(1)100蒲式尔产量的玉米总共吸收150磅N,60磅P_2O,与120磅K_2O,这已被多年实验所证实;(2)在作物吸肥过程中,土壤供应多少养分?乃随土壤肥力而异,作物在不施该养分小区中对该养分的
First, the problem raised and after the famous American soil scientist Truog is also one of the founders of soil testing and fertilization, he made in the Sixth International Society of Soil in 1960 entitled “soil testing fifty years” report. He attaches great importance to soil testing and fertilizer research and puts forward his original ideas and methods. The main points are as follows: (1) 100 bushels of corn yield absorbs a total of 150 pounds of N, 60 pounds of P 2 O and 120 pounds of K 2 O, Years of experiments confirmed; (2) in the process of fertilizer absorption of crops, the soil supply how much nutrients? With the soil fertility varies, the crop does not impose the nutrients in the area of the nutrient