ABSTRACT

Zinc (Zn) is the most deficient micronutrient globally resulting in malnutrition and requires improved mode of delivery for increased nutrient use efficiency. An innovative fertilizer formulation, Zincated nanoclay polymer composite (ZNCPC), containing a total 6.59% Zn was evaluated in a pot experiment in comparison with ZnSO₄ using rice (Oryza Sativa L.) (PRH 10 variety) as a test crop. The ZNCPC was applied in two doses [5.0 mg Zn kg⁻¹ (T1) and 2.5 mg Zn kg⁻¹ (T2)] whereas ZnSO₄. 7 H₂O was applied at single dose (5.0 mg Zn kg⁻¹) (T3) in Zn deficient soil along with a control (without application of Zn) (T4). Effects of two modes of Zn application were evaluated under maximum tillering (MT) (55 days after transplanting) and panicle initiation stage (PI) (70 days after transplanting) on DTPA Zn, Zn uptake, Olsen-P, P uptake and soil enzymatic activities in rhizosphere and non-rhizosphere soil. Treatment T1 increased DTPA-extractable Zn content in rhizosphere soil to 157% in PI stage in comparison with T3. Stimulation of soil enzymes activity namely, dehydrogenase, acid and alkaline phosphatase was recorded in rhizosphere soil. Our study demonstrates that ZNCPC could potentially to be novel and innovative fertilizer formulation to increase Zn uptake in rice.

摘要

锌 (Zn) 是全球最缺乏的微量营养素，导致营养不良，需要改进输送方式以提高营养素的使用效率。一种创新的肥料配方，锌纳米粘土聚合物复合材料 (ZNCPC)，在盆栽试验中与 ZnSO ₄相比，使用水稻（Oryza Sativa L.）（PRH 10 品种）作为试验作物，在盆栽试验中评估了总含量为 6.59% 的锌。ZNCPC 以两种剂量施用 [5.0 mg Zn kg ^-1 (T1) 和 2.5 mg Zn kg ^-1 (T2)] 而 ZnSO ₄。7 H ₂ O 以单剂量施用（5.0 mg Zn kg ^-1) (T3) 在缺锌土壤中与对照（不施用 Zn）（T4）。在最大分蘖（MT）（移栽后 55 天）和穗萌生期（PI）（移栽后 70 天）两种施锌方式对 DTPA Zn、Zn 吸收、Olsen-P、P 吸收和土壤酶促的影响根际和非根际土壤中的活性。与 T3 相比，处理 T1 在 PI 阶段将根际土壤中 DTPA 可提取的锌含量提高到 157%。在根际土壤中记录了土壤酶活性的刺激，即脱氢酶、酸性和碱性磷酸酶。我们的研究表明，ZNCPC 可能是一种新颖的创新肥料配方，以增加水稻对锌的吸收。