[Effects of combined applications of pig farm slurry and chemical fertilizer on medium- and micro-element contents and quality of wheat].

Taking Yangmai 18, widely cultivated in south of Huaihe River, as experimental material, this study investigated the effects of application of 0, 30, 60, 90 and 120 m3 x hm(-2) pig farm slurry (PS) at the wintering stage combined with the application of 0, 30, 60, 90 kg x hm(-2) urea at the heading stage on medium- and micro-element contents and quality of wheat. The results showed that the Ca, Mg and Fe contents of plant firstly decreased then increased with the extension of the growth period, but the Cu, Zn and Mn contents decreased continuously through the growth period. Ca, Mg, Cu and Zn reached the highest value at every growth stage except the jointing stage when applying 120 m3 x hm(-2) PS with 90 kg x hm(-2) urea.