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M. Hebbara , M. V. Manjunatha , S. G. Patil , V. B. Kullgod , P. S. Minhas

Abstract

A field experiment was conducted to evaluate the performance of tree species in salinewaterlogged soils during 1991-1998 at Agricultural Research Station, Gangavati, Karnataka. Six tree species viz: Hardwickia binata, Sesbania grandiflora, Acacia nilotica, Dalbergia sissoo, Casuarina equisetifolia and Azadirachta indica and a grass (Pennisetum purpureum) was selected for the study. Tree performance was evaluated in terms of survival, height, diameter (dbh) and canopy width in different salinity blocks (range <5 to >15 dS/m). Effect of combined stress of shallow water table and salinity (SEWN) on various growth parameters after two years of planting was also studied. Based on various tree growth parameters, A. nilotica out performed all other species at all salinity levels followed by C. equisetifolia. Higher establishment and better growth rate made it more suitable for saline conditions. A. nilotica and D. sissoo exbibited regenerability under its own cover. Growth of tree species was strongly related to SEWN than to isolated stress of shallow water table or salinity.

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S. R. Das ¹, S. G. Patil ¹, N. C. Nandi ¹

Affiliations
1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700 053, IN

Abstract

Zooplankton diversity of two frestiwater and two brackisliwater wetlands of Goa hiave beeen investigated during 2001-02 and 2002-03. A total of 42 species of zooplankton have been recorded, of which 41 species arc from freshwater wetlands, 29 species from brackish wetlands/ fisheries and 28 species common to both categories. This shows higher diversity of zooplankton in freshwater wetlands than in the brackishwater wetlands in Goa. The population density of different zooplankton groups as measured in terms of number of organisms per 50 litres of water have revealed higher population densities in freshwater wetlands (165-342 / 50 L) in comparison to that in brackishwater wetlands (86-181 / 50 L). In general, premonsoon population is higher than postmonsoon population in freshwater wetlands, while postmonsoon population is higher than premonsoon population in brackishwater wetlands.

Keywords

Zooplankton, Wetlands.

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Manjunatha Hebbara ¹, B. G. Masthanareddy ², S. G. Patil ³, V. C. Patil ³

Affiliations
1 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Dharwad (Karnataka), IN
2 Agricultural Research Station, Gangavati (Karnataka), IN
3 College of Agriculture, Bheemarayanagudi, Raichur (Karnataka), IN

Abstract

The effect of levels, splits and timings of NPK application on losses and partial balance of P and K in transplanted rice (Oryza sativa L) was studied at Agricultural Research Station, Gangavathi, Karnataka, during kharif 2000 and summer 2001. Leaching losses of both P and K were significantly higher under 250:55:104 kg NPK ha^-1 compared to 150:33:63 kg NPK ha^-1 and under only N splits compared to NPK splits. Leaching losses of both P and K were significantly higher during early cropping period, especially from planting to active tillering stage, irrespective of season. Application of fertilizers even at RDF level resulted in significant build up of soil P. Partial net K balance was negative under both the levels of fertilization and seasons. Application of 250:55:104 kg NPK ha^-1 through NPK splits up to beginning of grain filling stage recorded significantly higher grain yield and lower P and K leaching losses during both the seasons.

Keywords

Transplanted Rice, Phosphorus, Potassium, Leaching Losses, Partial Balance.

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Manjunatha Hebbara ¹, B. G. Masthanareddy ², S. G. Patil ³, V. C. Patil ⁴

Affiliations
1 Department of Soil Science, Agriculture College, University of Agricultural Sciences, Dharwad (Karnataka), IN
2 Agricultural Research Station, Gangavathi, Koppal (Karnataka), IN
3 College of Agriculture, Bheemarayanagudi, Raichur (Karnataka), IN
4 College of Agriculture, University of Agricultural Sciences, Raichur (Karnataka), IN

Abstract

The effect of levels, splits and timings of NPK application on losses, uptake and use efficiency of P and K in transplanted rice (Oryza sativa L) was studied at Agricultural Research Station, Gangavathi, Karnataka, during kharif 2000 and summer 2001. A higher level of NPK application (L₂) was beneficial which increased both P and K uptake resulting in higher yields. Application of split doses of either N or NPK did not influence P and K uptake and grain yield. Though the yields were higher with L₂, their agronomic efficiency decreased over L1. The agronomic efficiency of P and K were unaffected by N / NPK splits with BPT-5204 (kharif) but NPK splits significantly increased the AE of both P and K over only N splits with IR-64 (rabi/ summer). Though the recovery of P was not influenced by its level, its extended application increased P recovery. However, in case of K, both increased levels and extended levels of K increased K recovery.

Keywords

Transplanted Rice, Phosphorus, Potassium, Uptake, Recovery Efficiency, Agronomic Efficiency.

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B. G. Masthana Reddy ¹, Manjunatha Hebbara ², V. C. Patil ³, S. G. Patil ⁴

Affiliations
1 Agricultural Research Station, Gangavathi, Koppal (Karnataka), IN
2 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), IN
3 College of Agriculture, University of Agricultural Sciences, Raichur (Karnataka), IN
4 College of Agriculture, Bheemarayanagudi, Raichur (Karnataka), IN

Abstract

AExperiment was conducted at Agricultural Research Station, Gangavathi, Karnataka during kharif 2000 and summer 2001 to study the effect of levels, splits and timing of NPK application on growth, yield and economics in transplanted rice. Application of 250:55:104 kg N,P and K ha^-1 with NPK split application up to the beginning of grain filling stage recorded significantly higher grain yield of 7.02 and 8.03 t ha^-1 in kharif and summer season, respectively with corresponding net returns of Rs 36967 and Rs 33593 ha^-1.

Keywords

Dry Matter, Harvest Index, Net Returns, Split Application and Transplanted Rice.

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B. G. Masthana Reddy ¹, Manjunatha Hebbara ², V. C. Patil ³, S. G. Patil ⁴

Affiliations
1 Agricultural Research Station, Gangavathi, Koppal (Karnataka), IN
2 Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Dharwad (Karnataka), IN
3 College of Agriculture, University of Agricultural Sciences, Raichur (Karnataka), IN
4 College of Agriculture, Bheemarayanagudi, Raichur (Karnataka), IN

Abstract

A field experiment was conducted at Agricultural Research Station, Gangavathi, Karnataka, during Kharif 2000 and summer 2001 to study the effect of different N, P and K levels on growth and yield of irrigated rice. Application of 200:44:62 kg N, P and K ha-1 with an N:P:K ratio of 3.2:0.7:1for kharif rice and 250:44:62 kg ha-1 with an N:P:K ratio of 4:0.7:1 for summer rice appeared to be optimum for realizing higher grain yield and monetary returns. The higher grain yields were attributed to higher dry matter production as well as higher harvest index. Among the yield parameters, the number of panicles per unit area contributed most to the grain yield.

Keywords

Dry Matter, Harvest Index, Net Returns Transplanting.

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