Zinc deficiency in the wetlands of TNAU - native or induced?

摘要

Zinc efficiency is the widespread nutritional disorder constraining rice production worldwide. Field experiment was conducted in the M7 block of the wetlands of Tamil Nadu Agricultural University, Coimbatore with six genotypes (Norungan, ASD 16, White Ponni, CO 47, ADT 38 and PMK 3) and eight zinc treatments viz., zinc control, soil application of ZnSO₄, foliar spray of ZnSO₄ and soil application combined with foliar spray to find out if zinc efficiency in the soil was native or induced due to external factors. The exorbitantly high phosphorus availability (26.4 kg ha-1) in the wetland soil together with calcareousness are the reasons for poor availability of zinc in the soil. In such of those soils applying only maintainer dose of phosphorus, managing calcareousness and growing zinc efficient rice varieties can alleviate zinc stress without productivity decline.