Steel slag and phosphate nutrition of corn inoculated with arbuscular mycorrhizal fungi

Abstract: The objective of this work was to evaluate the effect of the use of steel slag as a soil acidity corrective and of mycorrhizal fungi associated with phosphate fertilization on corn plants. The study was performed in a greenhouse, using 3-kg pots with a Typic Haplorthox, in a 4x5x2 factorial arrangement, with four acidity correction treatments (C1, correction with dolomitic limestone at a dose of 4 Mg ha-1; C2, correction with steel slag at a dose of 4 Mg ha-1; C3, correction with a 1:1 mixture of 2 Mg ha-1 dolomitic limestone and 2 Mg ha-1 steel slag; and C4, control, without pH correction), five phosphorus doses (0, 42, 95, 213, and 480 mg dm-3), and the presence or absence of two arbuscular mycorrhizal fungi (Rhizophagus clarus and Gigaspora margarita), with five replicates. Steel slag was efficient in correcting soil pH and providing Ca and Mg for the plants; therefore, it could replace limestone. The inoculation with R. clarus and G. margarita, associated with P doses of 42, 95, and 213 mg dm-3, improved the development of corn plants after 45 days, resulting in greater plant height, stem diameter, leaf area, and shoot and root dry matter.

摘要：本研究旨在评估钢渣作为土壤酸度改良剂，以及菌根真菌与磷肥配施对玉米植株的影响。本实验于温室中开展，采用装载典型强发育湿润老成土（Typic Haplorthox）的3 kg盆钵，设置4×5×2因子试验设计：4种酸度改良处理（C1：以4 Mg·ha⁻¹剂量施用白云石石灰进行改良；C2：以4 Mg·ha⁻¹剂量施用钢渣进行改良；C3：按1:1比例混合2 Mg·ha⁻¹白云石石灰与2 Mg·ha⁻¹钢渣进行改良；C4：对照组，不进行pH改良）、5个磷素施用水平（0、42、95、213及480 mg·dm⁻³），以及2种丛枝菌根真菌（根内根孢囊霉Rhizophagus clarus和巨孢囊霉Gigaspora margarita）的接种与不接种处理，每组设置5次生物学重复。研究结果表明，钢渣可有效改良土壤pH，并为植株提供钙（Ca）与镁（Mg），因此可替代石灰石。当磷素施用水平为42、95及213 mg·dm⁻³时，接种上述两种丛枝菌根真菌可提升玉米植株45天生长期的生长发育表现，具体体现为株高、茎粗、叶面积及地上部与根系干物质积累量均显著提高。