Aimen Ayesha, Basit Abdul, Bashir Safdar, Aslam Zubair, Shahid Muhammad Faheem, Amjad Saba, Mehmood Khadija, Aljuaid Bandar S, El-Shehawi Ahmed M, Tan Kee Zuan Ali, Farooq Shahid, Li Yunzhou
Institute of Soil & Environmental Science, University of Agriculture Faisalabad, 38000, Pakistan.
Department of Soil Science, University College of Agriculture & Environmental Sciences, The Islamia University of Bahawalpur, 63100, Pakistan.
Saudi J Biol Sci. 2022 Jan;29(1):255-260. doi: 10.1016/j.sjbs.2021.08.086. Epub 2021 Aug 30.
Phosphorous (P) plays the prominent role to promote the plants storage functions and structural roles, as it is recognized as a vital component of ADP, ATP, Cell wall as well as a part of DNA. Soils acts as the sink to supply P to plants because soil pH and its physical condition are the main factor which regulate the solubility and availability P element. Phosphorus is not deficient in Pakistani soils but its availability to plants is the serious matter of concern. A pot experiment was conducted to evaluate P dynamics in two different soil series of Pakistan (Bahawalpur and Lyallpur) using Maize as test crop. The treatments applied were T0: Control (without any fertilizer), T1: Recommended DAP @648 mg pot, T2: Half dose DAP @324 mg pot, T3: Recommended rate of TSP @900 mg pot, T4: Half dose TSP @450 mg pot. Soil analysis showed that Bahawalpur soil has sandy clay loam texture with 33% clay and Lyallpur series has sandy loam texture with 15.5% clay; furthermore, these soil contain 4.6 and 2.12% CaCO respectively. Results showed an increase in P concentration in roots (23 mg kg) with the application of half dose of TSP in Lyallpur series and lowest in Bahawalpur series (14.6 mg kg) at recommended dose of DAP. Concentration of P in shoots responded the same; increase at half dose of TSP (16.7 mg kg) and lowest at full dose of DAP in Bahawalpur series as (15.58 mg kg). Adsorbed P (17 mg kg) was recorded highest in Bahawalpur soil with more clay amount in pot with DAP application but lower in Lyallpur soil series (14 mg kg) with the application of applied TSP. The PUE was recorded highest in Lyallpur series with the application of half dose of TSP and it was 61% more than control and was Highest in Bahawalpur series was with the application of recommended dose of DAP is 72% more than control treatment. On estimation; results showed that applied sources made an increase in P availability than control, but TSP gave better P uptake than DAP unless of rates applied. Soil of Lyallpur series showed better uptake of P and response to applied fertilizers than Bahawalpur series which showed more adsorption of P by high clay and CaCO amount. Conclusively, the study suggested that soil series play a crucial role in choosing fertilizer source for field application.
磷（P）在促进植物储存功能和结构作用方面发挥着重要作用，因为它被认为是二磷酸腺苷（ADP）、三磷酸腺苷（ATP）、细胞壁的重要组成部分，也是DNA的一部分。土壤是为植物供应磷的库，因为土壤pH值及其物理状况是调节磷元素溶解度和有效性的主要因素。巴基斯坦土壤中并不缺磷，但其对植物的有效性却是一个令人严重关切的问题。进行了一项盆栽试验，以玉米作为试验作物，评估巴基斯坦两个不同土壤系列（巴哈瓦尔布尔和莱亚尔布尔）中的磷动态。所采用的处理方法为：T0：对照（不施任何肥料），T1：推荐施用量的磷酸二铵（DAP）@648毫克/盆，T2：半剂量磷酸二铵@324毫克/盆，T3：推荐施用量的过磷酸钙（TSP）@900毫克/盆，T4：半剂量过磷酸钙@450毫克/盆。土壤分析表明，巴哈瓦尔布尔土壤质地为砂质粘壤土，粘土含量为33%，莱亚尔布尔系列土壤质地为砂壤土，粘土含量为15.5%；此外，这些土壤中碳酸钙含量分别为4.6%和2.12%。结果表明，在莱亚尔布尔系列土壤中施用半剂量过磷酸钙时，根系中的磷浓度增加（23毫克/千克），而在巴哈瓦尔布尔系列土壤中，按推荐剂量施用磷酸二铵时，磷浓度最低（14.6毫克/千克）。地上部的磷浓度也有相同的反应；在巴哈瓦尔布尔系列土壤中，半剂量过磷酸钙处理时地上部磷浓度增加（16.7毫克/千克），而在施用全剂量磷酸二铵时最低（15.58毫克/千克）。在施用磷酸二铵的盆中，巴哈瓦尔布尔土壤中吸附的磷（17毫克/千克）最高，因其粘土含量较高，而在施用TSP的莱亚尔布尔土壤系列中吸附的磷较低（14毫克/千克）。在莱亚尔布尔系列土壤中施用半剂量过磷酸钙时，磷利用效率（PUE）最高，比对照高61%，在巴哈瓦尔布尔系列土壤中，施用推荐剂量的磷酸二铵时，磷利用效率最高，比对照处理高72%。据估计，结果表明，施用的肥料源比对照提高了磷的有效性，但除非施用量不同，过磷酸钙比磷酸二铵的磷吸收效果更好。莱亚尔布尔系列土壤比巴哈瓦尔布尔系列土壤对磷的吸收更好，对施用肥料的反应也更好，后者因粘土和碳酸钙含量高而对磷的吸附更多。总之，该研究表明，土壤系列在为田间应用选择肥料源方面起着至关重要的作用。
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