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Articles by Guriqbal Singh
Total Records ( 5 ) for Guriqbal Singh
  Guriqbal Singh
  The aim of the study was to know the production potential of soybean and see if soybean could be grown successfully as an alternate to rice. Therefore, 8 field experiments were conducted during 1999 to 2001 on a loamy sand soil to find out optimum time of sowing, best genotype, optimum plant population, adequate seed rate and row spacing for achieving high yields of soybean. The grain yields of the crop sown on 24 May (1798 kg ha-1), 8 June (1828 kg ha-1) and 24 June (1878 kg ha-1) were on par, however, 8 July (1364 kg ha-1) sowing produced the lowest yield. Genotypes SL 459, SL 517, SL 525, SL 295 and PK 416 were high yielders (1456-2526 kg ha-1). Plant populations of 0.45 (1584 kg ha-1) and 0.60 million plants ha-1 (1609 kg ha-1) were on par in grain yield and produced higher yields than 0.30 million plants ha-1 (1436 kg ha-1). Row spacings of 45 and 60 cm and seed rates of 62.5, 75 and 87.5 kg ha-1 or 50, 62.5 and 75 kg ha-1 produced similar grain yields. Results from the present studies indicate that suitable production technology is available for achieving high grain yields of soybean and thus, it has a great potential for replacing some of the area currently under rice.
  Guriqbal Singh
  Poor plant stand is one of the important factors responsible for low yields of soybean (Glycine max (L.) Merrill). Poor plant stand, apart from other reasons, could also be due to rainfall soon after sowing but before emergence of the crop, which results in crust formation. The aim of the present study was to improve the emergence of soybean under crusted field conditions. Two field experiments were conducted on a loamy sand soil during kharif (rainy) season of 1999 and 2001 to study the effects of various mulching treatments on the emergence of soybean under simulated and natural rainfall. Under simulated rainfall the emergence of soybean was not only quicker but was also improved by covering rows with the use of 3 t wheat straw ha-1 and 5 t farmyard manure (FYM) ha-1 over no use of mulch (28.5, 26.5 and 18.5 plants m-1 row length after 6 days of sowing, respectively). Under natural rainfall the emergence improved substantially with the use of wheat straw mulch when only the rows of soybean were covered with it using 3 t straw mulch ha-1 (row mulch) or the whole plot was covered using 6 t straw mulch ha-1 (plot mulch). Row mulch, plot mulch and non-mulched plots had 23.0, 25.3 and 8.6-9.8 plants m-1 row length, respectively after 12 days of sowing. Row mulch as well as plot mulch treatments were very effective in reducing dry matter of weeds.
  Guriqbal Singh , H.S. Sekhon , Gurdip Singh , J.S. Brar , T.S. Bains and S. Shanmugasundaram
  Optimum plant population is a prerequisite for obtaining high yields of any crop. The aim of the study was to find out the optimum plant density of mungbean for obtaining high grain yield. Field investigations were undertaken at Punjab Agricultural University (PAU), Ludhiana, India on a loamy sand soil and at Asian Vegetable Research and Development Center (AVRDC), Taiwan on a sandy loam soil. At PAU, 40 plants m-2 at 25x10 cm spacing gave significantly higher grain yield than 33 plants m-2 at 30x10 cm spacing. Genotypes Pusa Vishal (selection from AVRDC material NM 92), SML 668 (selection from NM 94) and Pusa 9531 were on par in the grain yield and were better than UPM 98-1 and MH 96-1. Pusa Vishal and SML 668 had significantly larger seed size compared to Pusa 9531 and MH 96-1. At AVRDC, 20 plants m-2 sown at 50x10 cm spacing was the optimum for achieving higher grain yield and at higher plant densities, the yield tended to decrease. Lodging score was higher under higher plant densities. Genotypes NM 92 and VC 3890-A were superior to NM 94 and SML 134 in grain yield. Interaction between genotypes and plant density was non-significant for grain yield and other characters at both the locations.
  Guriqbal Singh
  Optimum plant population and planting geometry are the important factors for obtaining high grain yields of soybean. The aim of the present study was to find out optimum plant population and planting geometry in soybean. Accordingly three field experiments were conducted. An experiment studied the effect of three plant populations (0.30, 0.45 and 0.60 million plants ha-1) on the growth and yield of eight soybean genotypes. Plant populations of 0.45 and 0.60 million plants ha-1 with grain yield of 1474 and 1516 kg ha-1, respectively, were on par and produced significantly higher grain yields than 0.30 million plants ha-1 (1285 kg ha-1). Genotype SL 525 produced the highest grain yield (2432 kg ha-1) followed by SL 517 (1802 kg ha-1). Two experiments studied the effect of three planting geometries (row spacing of 22.5, 30 and 45 cm with constant plant population of 0.45 million plants ha-1) on the growth and yield of eight genotypes in 2003 and six genotypes in 2004. Planting geometries differed neither in growth nor in yield. Genotype SL 525 was the highest yielder (3452 kg ha-1 in 2003 and 3264 kg ha-1 in 2004). Genotype JS 335- the most popular genotype in central and southern India- failed at Ludhiana i.e., in northern India (291 kg grain yield ha-1) due to high infestation with mungbean yellow mosaic virus as Ludhiana is the hot spot for this disease. Plant population of 0.45 million plants ha-1 and row spacing of 45 cm were found optimum for soybean productivity.
  Guriqbal Singh , H.S. Sekhon and Harpreet Kaur
  Adequate and balanced nutrition is essential for obtaining high grain yields. The aim of the study was to find out proper nutrient management in chickpea using different sources of nutrients. Two field experiments were conducted to study the effects of Farmyard manure (FYM), phosphorus, zinc sulphate, vermicompost and nitrogen+phosphorus application on the growth and yield of chickpea. On the basis of three-year mean, as compared to no application of nutrients, the application of 5 t FYM ha-1 improved chickpea grain yield by 14.89%, 30 and 60 kg P2O5 ha-1 by 14.81 and 21.85% and 25 kg ZnSO4 ha-1 by 5.18%. Chickpea grain yield increased with successive increase in dose of vermicompost from 0 to 3 and 2 t ha-1 seemed to be the optimum dose. Applications of 10 kg N + 20 kg P2O5 ha-1 and 20 kg N + 40 kg P2O5 ha-1 increased the grain yield by 18.97 and 24.20%, respectively over no application of nitrogen and phosphorus. Increase in grain yield with the application of various nutrients was due to improvement in plant growth and yield attributes. The study highlights the importance of using nutrients through various sources for realizing high productivity of chickpea.
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