An Asian Journal of Soil Science

A. Sireesha ¹, P. C. Rao ², S. Ramalakshmi ²

Affiliations
1 Andhra Pradesh Rice Research Institute and Regional Agricultural Research Station, Maruteru, West Godavari (A.P.), IN
2 All India Co-Ordinated Research Project on Weed Control, Acharya N.G. Ranga Agricultural University, Hyderabad (A.P.), IN

Abstract

Field experiment was conducted to study the residues of pendimethalin in edible parts of radish and its persistence in soil. At harvest in both the seasons of winter and summer more than 98per cent of initial deposit of pendimethalin was dissipated and observed half life in radish field was 6.45 days and 10.03 days for pendimethalin applied as pre emergence @ 0.5 and 0.75 kg a.i. ha^-1, respectively. In radish tubers the detected residues of pendimethalin were 0.0026 mg kg^-1 and 0.0063 mg kg^-1 during winter season and 0.0027 mg kg^-1 and 0.0056 mg kg^-1 when pendimethalin applied at 0.5 and 0.75 kg a.i. ha^-1, respectively.

Keywords

Pendimethalin, Persistence, Radish, Residues, Soil.

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A. Sireesha ¹, P. Prasuna Rani ²

Affiliations
1 Andhra Pradesh Rice Research Institute and Regional Agricultural Research Station, Maruteru, West Godavari (A.P.), IN
2 Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatala (A.P.), IN

Abstract

A field experiment was conducted at College Farm, College of Agriculture, Bapatla during Rabi 2002-2003 to study the effect of flyash and fertilizer levels on yield and nutrient uptake of groundnut. The experiment was laid out in Randomized Block Design with Factorial Concept with four levels of flyash (0, 5, 10 and 15 t ha^-1), four levels of fertilizers (70, 80, 90 and 100% recommended dose of fertilizers) and a control without any fertilizers and flyash. The flyash collected from Vijayawada Thermal Power Station, Ibrahimpatnam is a potential source of plant nutrients. The pod and haulm yield and nutrient uptake significantly increased with flyash, fertilizers and their interaction. However, yield and nutrient uptake showed more response to the fertilizers than flyash. With increase in the levels of fertilizers, yield and nutrient uptake increased and the differences recorded between 70 per cent RDF and 80 per cent RDF were significant. However, at further levels increase showed decreasing trend and the difference was non-significant. Application of fly ash @ 10 t ha^-1 increased the yield and nutrient uptake significantly over 0 t ha^-1 and 5 t ha^-1. However, with further increase in the levels of flyash 15 t ha-1, the increase was non-significant. The combined application of flyash @ 15 t ha^-1 and fertilizer @ 100 per cent recommended dose was at par with flyash @ 10 t ha^-1 and 80 per cent recommended dose of fertilizer gave significantly higher pod and haulm yield and nutrient uptake, suggesting 20 per cent saving of fertilizers. The soil was analyzed for micronutrient status using D.T.P.A. with atomic adsorption spectrophotometer. Soil extractable zinc, iron, manganese and copper content was significantly increased from 1.04 to 1.33, 7.52 to 10.11, 12.84 to 16.45 and 1.47 to 2.12 at harvest due to the application of flyash from 0 to 15 t ha^-1. Application of fertilizers from 70 to 100 per cent of recommended dose significantly increased soil extractable zinc, iron, manganese and copper content increased from 1.13 to 1.25, 8.66 to 9.32, 15.88 to 17.06 and 1.71 to 1.89 at harvest. However, the interaction effect of both flyash and fertilizers was not significant. The increase in dehydrogenase enzyme activity was significant at lower doses of flyash application from 0, to 10 t ha^-1 further increase in enzyme activity due to the application of flyash was not significant. However, extensive studies with flyash on different crops are needed for further confirmation of the results.

Keywords

Flyash, Fertilizers, Soil Nutrient Status, Dehydrogenase, Groundnut.

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S. Rama Lakshmi ¹, T. Sreelatha ¹, A. Sireesha ¹

Affiliations
1 Regional Agricultural Research Station, Anakapalle, Visakhapatnam (A.P.), IN

Abstract

Experiment was conducted at Regional Agricultural Research Station, Anakapalle during 2013- 14 to study the distribution of macro and micronutrients in sugarcane leaf, sheath and whole plant at different growth stages and their uptake by whole plant in different sugarcane genotypes/varieties. Six genotypes were selected i.e. 96A3, 98A163, 2000A225 (mid late) and 97A85, 2001A63 and 2000A56 (early). Results revealed that contents of all the macro and micro nutrients in all the genotypes were decreased from formative to grand growth phase in all the parts of sugarcane i.e. leaf, sheath and whole plant. At formative and grand growth phase more amount of N and K was accumulated in leaf followed by sheath and whole plant, where as phosphorus content was highest in leaf followed by whole plant and sheath. Among mid late genotypes highest nitrogen content was observed in 2000A225, phosphorus and potassium content was more in 96A3. In both formative and grand growth phase more zinc, iron and manganese content was recorded in 2000A225, whereas more copper content was recorded in 98A163. Whereas in early genotypes, more nitrogen content was observed in 2001A63, phosphorus and potassium content was more in 2000A56 except leaf potassium at formative phase as it was more in 97A85. In both formative and grand growth phase more zinc and iron content was recorded in 2001A63. Manganese content was more in 97A85, whereas more copper content was recorded in 2000A56. Among different prerelease genotypes 2001 A 63 exhibited highest nitrogen uptake of 219.90 kg ha-1 followed by 2000A225 (209.78 kg ha^-1) and 97A85 (209.66 kg ha^-1), whereas highest P uptake of 62.70 kg ha^-1 was recorded by 2000A225 and highest potassium uptake of 264.99 kg ha^-1 and it was closely followed the 2001A 63 genotype (263.96 kg ha^-1).

Keywords

Sugarcane, Nutrient content, Uptake.

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