《Table 7 Effect of different treatments on amino acids》

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《"Effect of slow-release iron fertilizer on iron-deficiency chlorosis, yield and quality of Lilium davidii var.unicolor in a two-year field experiment"》

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EAA，essential amino acids；TEAA，total essential amino acids；NEAA，nonessential amino acids；TNEAA，total nonessential amino acids.

A 2-year field experiment was designed and conducted from February 2015 to November 2016 at the Gaolan Research Station of Ecology and Agriculture，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences.The station is located in the northwestern area of the Loess Plateau（Lanzhou City，Gaolan County，Gansu Province，China；36°13&apos；N，103°47&apos；E）at an altitude of approximately 1，800 m.Based on 30-year records，mean annual rainfall is 263 mm of which nearly 70%occurs between June and September.The mean annual temperature of the region is 8.4°C，with monthly mean temperature reaching a maximum of 20.7°C in July and a minimum of-9.1°C in January.The soil is a silt loam of loess origin and belongs to the Haplic Orthic Aridisols.Initial soil characteristics were tested before basal fertilizer application to a depth of 40 cm，and the results are presented in Table 1.