Agroscope, Field-Crop Systems and Plant Nutrition, Route de Duillier 50, P.O. Box 1012, CH-1260, Nyon, Switzerland.
Aix Marseille Univ, Avignon Université, CNRS, IRD, IMBE, Marseille, France.
J Environ Manage. 2021 May 1;285:112061. doi: 10.1016/j.jenvman.2021.112061. Epub 2021 Feb 11.
The potential to use calcium phosphite (Ca-Phi) as phosphorus (P) fertilizer may represent an effective recycling of P-containing by-products. A greenhouse experiment was conducted to investigate the effect of Ca-Phi (38 kg P ha) on soil properties and the growth parameters of four green manure species in clay and sandy soils using Ca-Phi, TSP (triple superphosphate) and control (no fertilization) as treatments. Eight weeks after sowing, we measured aboveground biomass yield, phosphite (Phi) concentration in plant biomass, different soil P pools as well as microbial biomass nutrients. Compared to control, the addition of Ca-Phi did not negatively affect green manure yield, except for lupine (Lupinus albus L.) in clay soil. The Phi concentration in plant biomass varied across species and soil type with a maximum concentration of about 400 mg Phi kg for mustard (Brassica juncea L.) in clay soil. Compared to control, TSP and Ca-Phi fertilization had a similar effect on different P pools and microbial biomass nutrients (C, N and P) although the response was soil-type dependent. In the sandy soil, after Ca-Phi addition the amount of available P (P) increased to the same extent as in the TSP treatment (i.e. around 6 mg P kg) suggesting that Ca-Phi was, at least partly, oxidized. In the clay soil with high P fixing capacity, Ca-Phi promoted higher P than TSP likely due to different solubility of chemical P forms. Additional studies are however required to better understand soil microbial responses and to quantify the P agronomical efficiency for the following crop under Ca-Phi fertilization.
将亚磷酸钙（Ca-Phi）用作磷肥的潜力可能代表了一种有效的含磷副产品回收利用方式。本温室试验以亚磷酸钙（38kg P ha）、过磷酸钙（TSP）和对照（不施肥）为处理，研究了亚磷酸钙对粘土和沙壤土中四种绿肥物种生长参数和土壤特性的影响。播种 8 周后，我们测量了地上生物量产量、植物生物量中的亚磷酸盐（Phi）浓度、不同土壤磷库以及微生物生物量养分。与对照相比，除了在粘土中种植羽扇豆（Lupinus albus L.）外，添加亚磷酸钙并未对绿肥产量产生负面影响。植物生物量中的 Phi 浓度因物种和土壤类型而异，在粘土土壤中芥菜（Brassica juncea L.）的 Phi 浓度最高约为 400mg Phi kg。与对照相比，TSP 和 Ca-Phi 施肥对不同的 P 库和微生物生物量养分（C、N 和 P）有相似的影响，尽管这种反应取决于土壤类型。在沙壤土中，添加 Ca-Phi 后有效磷（P）的含量增加到与 TSP 处理相同的程度（即约 6mg P kg），这表明 Ca-Phi 至少部分被氧化了。在高磷固定能力的粘壤土中，Ca-Phi 比 TSP 更能促进 P 的吸收，这可能是由于化学 P 形态的溶解度不同。然而，需要进一步的研究来更好地理解土壤微生物的响应，并量化在 Ca-Phi 施肥下后续作物的磷农学效率。
