National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Agricultural production continues to be constrained by a number of biotic and abiotic factors that can reduce crop yield quantity and quality. Potassium (K) is an essential nutrient that affects most of the physiological processes that influence plant growth. To understand the effect of potassium, a pot culture experiment was carried out with graded levels of potassium to study the influence of potassium on physiological parameters of maize in black calcareous and non-calcareous soils. Results indicated that Leaf area index, photosynthetic rate and stomatal conductance were significantly influenced up to 120 kg K2O ha-1 in calcareous soil, whereas SPAD values were significantly influenced up to 80 kg K2O ha-1. In non-calcareous soil, SPAD values, Leaf Area Index and stomatal conductance were significantly enhanced upto 80 kg K2O ha-1 while photosynthetic rate increased up to 120 kg K2O ha-1. Hence, to increase the physiological activity of hybrid maize, potassium @ 120 kg K2O ha-1 is necessary for black calcareous soil and 80 kg K2O ha-1 required for black non-calcareous soils in Inceptisol. Grain and straw yield of maize was positively correlated with physiological parameters like leaf area index and photosynthetic rate in calcareous soil and photosynthetic rate and stomatal conductance in non-calcareous soil. Balanced fertilization and efficient K usage in combination with other nutrients not only contribute to sustainable crop’s growth, yield and quality, but also influence plant health and reduce the environmental risks.
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