Informatics Publishing Limited

Naveen Garg ¹, Omkar Sharma ¹

Affiliations
1 Acoustics, Ultrasonic, Shock and Vibrations Standards, Apex Level Standards and Industrial Metrology Division, National Physical Laboratory, CSIR, New Delhi, IN

Abstract

The present work discusses the methodology and procedure followed at NPLI for calibration of charge amplifiers. The charge amplifiers are calibrated conventionally using a 1 nF standard capacitor and sine generator for gain measurements. An automated calibration system using B&K Calibration software in conjunction with a calibrated 1 nF precision adaptor controlled by Pulse Analyzer is also used for precision calibration of charge amplifiers for gain and phase measurements from 0.5 Hz to 20 kHz. The uncertainty achieved in gain calibration is reported in the present work.

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Naveen Garg ¹, S. K. Jindal ², M. S. Dhaliwal ², D. S. Cheema ²

Affiliations
1 Regional Research Station, Punjab Agricultural University, Bathinda-151 001, Punjab, IN
2 Department of Vegetable Science, Punjab Agricultural University, Ludhiana-141004, IN

Abstract

Six promising tomato hybrids selected from a pool of 60 F1 hybrids were evaluated for seven traits, along with the check hybrid (TH-1) at two locations falling under different agro-climatic zones of Punjab, India. G × E interaction was significant for early yield, fruit weight and total fruit yield, whereas, it was non-significant for fruit number, locule number, pericarp thickness and vine length. Overall higher mean-early-yield, fruit number, fruit weight and total yield at Ludhiana, rather than at Bathinda, may be due to higher organic carbon, available phosphorus and available potash and low electrical conductivity of the experimental soil at Ludhiana. Pooled analysis showed that hybrid TH-21 had the maximum early-yield (3.73 tha-1), fruit weight (72.7 g) and locule number (2.65), whereas, TH-23 had the highest fruit number per vine (53.7) and total fruit yield (51.2 tha^-1). The magnitude of pooled standard heterosis was maximum for vine length (140.7%), followed by early yield (114.8%), total yield (88.3%), fruit number (49.7%), fruit weight (27.6%), pericarp thickness (16.4%) and locule number (-21.6%). On the basis of stability and superiority for fruit weight, fruit number, early and total yield, TH-21 was found to be the most promising hybrid, followed by TH-23.

Keywords

Fruit Number, Fruit Weight, Hybrid, Stability, Tomato, Yield.

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