Bouray Moussa, Moir Jim, Condron Leo, Lehto Niklas
Department of Soil Science, Lincoln University, Lincoln 7647, Christchurch, New Zealand.
AgroBioSciences Program, Mohammed VI Polytechnic University (UM6P), Benguerir 43150, Morocco.
Plants (Basel). 2020 Jul 13;9(7):883. doi: 10.3390/plants9070883.
Legumes play critical dual roles in grazed grassland ecosystems; providing nitrogen inputs and high-quality feed for grazing livestock. However, many species fail to persist in acidic, low fertility soils. A glasshouse study was conducted to investigate the response of lucerne () to phosphogypsum (PG), lime and soluble P + S fertilizer (PS) application to two soils. Phosphorus and sulphur were applied through either PG (0, 1, 3 and 9 t ha) or P + S fertilizer at equivalent rates to PG. Both PG and PS were applied with or without lime, which was applied at 2 t ha. Yield and nutrient uptake of the lucerne was measured, while the soil was analyzed for pH, Olsen P and exchangeable aluminum. Yield responses were significantly different between the two soils. Maximum yields and P and S uptakes were obtained under PG 9 t ha combined with lime. Exchangeable Al decreased in both soils under 1 ha of PG compared with the control. At the highest rate, Olsen P increased by 8 and 6 mg kg for PG and by 6 and 11 mg kg for PS compared with the control for Glenmore and Molesworth soils respectively. Phosphogypsum showed positive effects on P and S bioavailability.
豆科植物在放牧草地生态系统中发挥着关键的双重作用；为放牧牲畜提供氮素输入和优质饲料。然而，许多物种在酸性、低肥力土壤中难以持续存在。开展了一项温室研究，以调查紫花苜蓿对磷石膏（PG）、石灰以及可溶性磷+硫肥料（PS）施用于两种土壤的反应。通过PG（0、1、3和9吨/公顷）或与PG等量的磷+硫肥料施用磷和硫。PG和PS均在施或不施石灰（2吨/公顷）的情况下施用。测定了紫花苜蓿的产量和养分吸收情况，同时分析了土壤的pH值、 Olsen磷和交换性铝。两种土壤之间的产量反应存在显著差异。在9吨/公顷PG与石灰结合的情况下获得了最高产量以及磷和硫的吸收量。与对照相比，在1公顷PG处理下，两种土壤中的交换性铝均减少。在最高施用量下，与对照相比，Glenmore和Molesworth土壤中PG的Olsen磷分别增加了8和6毫克/千克，PS的Olsen磷分别增加了6和11毫克/千克。磷石膏对磷和硫的生物有效性显示出积极影响。
