Impact of high density planting system and growth retardants on root growth and yield attributes in machine sown cotton

Field experiments were carried out during winter irrigated seasons of 2017 and 2018 at Department of Coimbatore. The experiments were laid out in split plot design with three replications. Treatments comprised of three crop geometries viz., 75 cm x 10 cm (M 1 ), 75 cm x 20 cm (M 2 ) and 75 cm x 30 cm (M 3 ) and seven sub plots with foliar application of different doses of growth retardants along with one control viz., Cycocel 400 ppm (S 1 ), Cycocel 500 ppm (S 2 ), Mepiquat Chloride 100 ppm (S 3 ), Mepiquat Chloride 200 ppm (S 4 ), Maleic Hydrazide 400 ppm (S 5 ), Maleic Hydrazide 500 ppm (S 6 ) and Control (No Spray) (S 7 ). Crop was sown in raised bed with inclined plate planter and the major cultivation practices were carried out with machines. The machines used for cotton cultivation were, inclined plate planter for sowing, boom sprayer for pre emergence application, power weeder for weeding, drip irrigation system for irrigation and fertigation and harvesting was done manually. Cotton cultivated under 75 cm x 10 cm spacing in conjunction with foliar application of mepiquat chloride 200 ppm at 45 and 60 Days After Sowing (DAS) significantly influenced the root parameters like root length, root volume, root dry weight and yield attributes like number of sympodia, number of bolls per plant, boll weight and seed cotton yield.

[1]  J. Kazda,et al.  Management of sunflower stand height using growth regulators , 2018 .

[2]  M. Saleem,et al.  Growth, yield and earliness response of cotton to row spacing and nitrogen management. , 2015 .

[3]  U. Surendran,et al.  Drip fertigation effects on yield, nutrient uptake and soil fertility of Bt Cotton in semi arid tropics , 2014 .

[4]  Blaise.,et al.  Evaluation of cotton genotypes for high density planting systems on rainfed vertisols of central India. , 2011 .

[5]  Wei Tang,et al.  Effects of plant density and nitrogen and potassium fertilization on cotton yield and uptake of major nutrients in two fields with varying fertility , 2010 .

[6]  J. D. Clement,et al.  Alteration of cotton source–sink relations with plant population density and mepiquat chloride , 2010 .

[7]  P. D. Bhalerao,et al.  Effect of Spacing and Fertilizer Levels on Seed Cotton Yield Under Rainfed Condition , 2010 .

[8]  A. Halepyati,et al.  Studies on the manipulation of growth as a means of increasing productivity of Bt cotton (Gossypium hirsutum L.). , 2010 .

[9]  C. Chinnusamy,et al.  Soil moisture and water use studies under drip and furrow irrigation methods in hybrid cotton. , 2009 .

[10]  K. Kalaichelvi.  Bt cotton response to plant geometry and fertilizer levels. , 2009 .

[11]  M. Gopinath,et al.  Influence of fertilizers and plant geometry on performance of Bt cotton hybrid. , 2008 .

[12]  A. Giri,et al.  Response of Bt cotton hybrids to plant densities and fertilizer levels. , 2008 .

[13]  P. D. Bhalerao,et al.  Performance of BT cotton hybrids for various spacing under rainfed condition , 2008 .

[14]  N. Prasad,et al.  Agronomic evaluation of Gossypium hirsutum hybrids for varied spacings and nitrogen levels in vertisols under rainfed conditions. , 2007 .

[15]  K. Hayat,et al.  Cotton Response to Mepiquat Chloride and Nitrogen under Ultra Narrow Plant Spacing , 2007 .

[16]  V. Jindal,et al.  Performance of Bt cotton hybrids under different geometrical arrangements. , 2007 .

[17]  R. Sisodia,et al.  American cotton varieties as influenced by plant densities and fertility levels under rainfed conditions. , 2007 .

[18]  G. Srinivasan.  Agronomic evaluation of Bt cotton hybrids in summer irrigated tract of southern Tamil Nadu. , 2006 .

[19]  G. Buttar,et al.  Performance of Bt cotton hybrids at different plant populations in south western region of Punjab. , 2006 .

[20]  E. Vories,et al.  AGRONOMY AND SOILS Comparison of Growth and Yield Components of Conventional and Ultra-narrow Row Cotton , 2006 .

[21]  Z. Sawan,et al.  Response of Yield, Yield Components, and Fiber Properties of Egyptian Cotton (Gossypium barbadense L.) to Nitrogen Fertilization and Foliar-applied Potassium and Mepiquat Chloride , 2006 .

[22]  E. Norton,et al.  Evaluation of Two Plant Growth Regulators from LT Biosysn , 2005 .

[23]  B. A. Sakhare,et al.  Effect of spacing and nitrogen on growth and yield of the deshi hybrid cotton AKDH 7. , 2005 .

[24]  R. K. Sarkar,et al.  Effect of method of planting and crop geometry on productivity of rainfed upland cotton (Gossypium hirsutum) grown in lowland rice (Oryza sativa) fallows , 2004 .

[25]  H. J. Choi,et al.  Bulbil formation and yield responses of Chinese yam to application of gibberellic acid, mepiquat chloride and trinexapac-ethyl , 2003 .

[26]  J. T. Cothren,et al.  Phenotypic Alterations and Crop Maturity Differences in Ultra‐Narrow Row and Conventionally Spaced Cotton , 2001 .

[27]  T. A. Kerby,et al.  Genotypes and Plant Densities for Narrow‐Row Cotton Systems. I. Height, Nodes, Earliness, and Location of Yield , 1990 .

[28]  P. W. Khorgade,et al.  Path-coefficient analysis in upland cotton. , 1980 .

[29]  R. Briggs,et al.  Within- and Between-Row Spacing of Cotton , 1967 .