Vol. 6, Issue 2 (2018)
Conjoint application of organic and inorganic sources of nutrients on uptake of heavy metals (Cd, Cr, Ni, Pb) in straw and grain of rice and wheat
Author(s): Maneesh Kumar and S. K. Singh
Abstract: Field experiments were conducted for two years in sandy loam soil to study the direct effect of organic (sewage sludge, vermicompost and sesbania) and inorganic (chemical fertilizers) source of nutrients on rice (Oryza sativa) and their residual effect on wheat (Triticum aestivum) grown in sequence 2015-16 to 2016-17 at Varanasi, Uttar Pradesh. The present study was taken up to evaluate the effect of organic amendments on heavy metals accumulation in grain and straw of rice. In the experiment, 75% recommended dose of fertilizer were applied along with quantities of the organic sources calculated on the basis of 25% N equivalent. The applied treatments effect were compared with the absolute control (N: P2O5: K2O: 00:00: 00) and recommended dose of fertilizers i.e. 150, 60 and 60 kg N, P2O5 and K2O ha−1. Application of organics amendments increased the uptake of heavy metals in grain and straw. The highest (2.91 g ha-1) total uptake of cadmium in rice was recorded in customized fertilizer (T4) followed by T5 sewage sludge (2.81 g ha-1) with a respective increase of 1.69 and 1.60 times over 100% RDF. During second year (2016-17) the highest total uptake (2.07 g ha-1) of Cd was recorded in 75% RDF + 25% N through sewage sludge followed by customized fertilizer (1.73 g ha-1) which was 1.2 and 0.8 times higher over 100% RDF and 2.8 and 2.2 times higher over control, respectively in II rice. The maximum (7.08 g ha-1) total chromium uptake of I rice was recorded in 75% RDF + 25% N through sesbania and minimum in control (T1). The treatments which received 100% RDF, customized fertilizer, 75% RDF + 25% N through sewage sludge and 75% RDF + 25% N through vermicompost did not significantly differ to each other. The total uptake of chromium varied from 0.20 to 2.63 g ha-1 in I wheat. Treatment T2, T3, T4, T6 and T7 were significantly at par with each other. The total nickel uptake of I rice varied from 0.38 to 2.01 g ha-1. The highest (7.54 g ah-1) total uptake of nickel was recorded in 100% RDF + S40, Zn5, B1.5 followed by 75% RDF + 25% N through sesbania (7.08 g ha-1) which was 59 and 49% higher over 100% RDF (T2), respectively. The total uptake of nickel in I wheat varied from 4.87 to 23.11 g ha-1. The total uptake of lead varied from 0.24 to 0.71 g ha-1 in I rice. The highest (0.71 g ha-1) total uptake of lead was recorded in 75% RDF + 25% N through sewage sludge and minimum was recorded in control in I rice. The highest total uptake of I wheat was recorded in treatment (T5) in which sewage sludge was applied in I rice. During second year, the highest total uptake of lead was recorded in 75% RDF + 25% N through sewage sludge and minimum was recorded in control in II rice. The total uptake of lead varied from 0.018 to 0.179 g ha-1 in II wheat. The treatment T3, T4 and T6, T7 were statistically at par with each other in II wheat.
Pages: 2423-2427 | 476 Views 50 Downloads
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How to cite this article:
Maneesh Kumar, S. K. Singh. Conjoint application of organic and inorganic sources of nutrients on uptake of heavy metals (Cd, Cr, Ni, Pb) in straw and grain of rice and wheat. Int J Chem Stud 2018;6(2):2423-2427.
