Pigeonpea (Cajanus cajan (L.) Millsp.) is grown globally for its protein-rich seed. However, low availability of soil zinc (Zn) adversely affects the seed yield of pigeonpea. The present study was therefore conducted to assess the Zn efficiency of pigeonpea genotypes based on seed yield and seed Zn uptake efficiency. Field experiments were conducted at the Indian Council of Agricultural Research–Indian Institute of Soil Science, Bhopal, India with twenty different pigeonpea genotypes and two levels of Zn application under a split-plot design. The two levels of Zn were low (without application of Zn fertilizer) and high (with application of 20 kg Zn ha⁻¹ (as ZnSO₄∙7H2O) as basal soil application, in conjunction with three foliar sprays of 0.50% (w/v) ZnSO₄∙7H₂O aqueous solution) (with 0.25% lime as neutralizing agent) at flowering, pod formation, and pod filling stages). Application of Zn improved plant height, branches plant⁻¹, pods plant⁻¹, seeds pod⁻¹, and 100 seed weight of pigeonpea genotypes differently. The mean seed yield, seed Zn concentration, and seed Zn uptake of the genotypes increased from 1.71 to 2.12 t ha⁻¹, 32.4 to 43.0 mg kg⁻¹, and 54.9 to 90.6 g ha⁻¹, respectively, with application of Zn. The seed yield efficiency index (SYEI) and Zn uptake efficiency index (ZUEI) of pigeonpea genotypes varied from 67.0 to 92.5 and from 47.0 to 69.9, respectively. Based on SYEI and ZUEI, the genotypes were classified as efficient and responsive (Virsa Arhar-1, GT-1, GT-101, SKNP 05-05, BDN-2, AAUT 2007-04, BSMR 853, T 15-15, DT 23, Pusa 9), efficient and non-responsive (ICPL 87119, PKV Trombay), inefficient and responsive (AKT 8811, Hisar Paras), and inefficient and non-responsive (AAUT 2007-10, JKM 7, Hisar Manak, C 11, Hisar HO2-60, GAUT 93-17). The efficient and responsive genotypes are the most useful as they yield well under low soil Zn conditions and also respond to Zn fertilizer application. The inefficient and responsive genotypes could be utilized for plant breeding programs by plant breeders for identification and utilization of responsive traits.

中文翻译：

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锌效率的木豆（Cajanus cajan（L.）Millsp。）基因型的分类。

木豆（Cajanus cajan（L.）Millsp。）因其富含蛋白质的种子而在全球范围内种植。但是，土壤锌（Zn）的低利用率会对木豆的种子产量产生不利影响。因此，本研究旨在根据种子产量和种子对锌的吸收效率评估木豆基因型的锌效率。在印度农业研究委员会–印度博帕尔印度土壤科学研究所进行了田间试验，采用分块图设计，使用了二十种不同的木豆基因型和两个水平的锌施用水平。两种水平的锌含量低（不施用锌肥）和高（施用20 kg Zn ha ^-1（作为ZnSO ₄ ∙7H2O）作为基础土壤施用，以及三份0.50％（w/ v）在开花，结荚形成和结荚填充阶段使用ZnSO ₄ ∙7H ₂ O水溶液（含0.25％的石灰作为中和剂）。锌的施用不同地提高了基因型木豆的株高，树枝植物^-1，豆荚植物^-1，种子荚果^-1和100种子重量。的平均种子产量，种子Zn浓度，和基因型的种子锌吸收从1.71增加至2.12吨公顷^-1，32.4至43.0毫克千克^-1，和54.9到90.6克公顷^-1分别使用锌。木豆基因型的种子产量效率指数（SYEI）和锌吸收效率指数（ZUEI）分别从67.0至92.5和47.0至69.9。根据SYEI和ZUEI，基因型被分类为有效和反应性（Virsa Arhar-1，GT-1，GT-101，SKNP 05-05，BDN-2，AAUT 2007-04，BSMR 853，T 15-15， DT 23，Pusa 9），高效且无响应（ICPL 87119，PKV Trombay），低效且无响应（AKT 8811，Hisar Paras）以及低效且无响应（AAUT 2007-10，JKM 7，Hisar Manak，C） 11，Hisar HO2-60，GAUT 93-17）。高效和敏感的基因型是最有用的，因为它们在土壤锌含量低的条件下产量高，并且对锌肥的施用也有响应。