Shant LalPal, Mahesh2016-08-052016-08-052015-08http://krishikosh.egranth.ac.in/handle/1/71024Thesis-PhDThe present investigation entitled “Response of different high density spacings on growth, yield and quality of guava (Psidium guajava L.) cv. Pant Prabhat.” was conducted at Horticulture Research Centre, Patharchatta and in the Department of Horticulture of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand during the year 2012-13 and 2013-14. The treatments were consisted of four plant spacings i.e. 1.0X1.0 m (S1), 2.0X1.0m (S2), 2.0X1.5m (S3) and 1.5X1.5m (S4). Thus there were four treatments replicated six times with 12 plants as an experimental unit in randomized block design. Findings of the present investigation revealed that close spaced plants 1.0x1.0m (S1) gave significantly higher plant height but reduce plant spread and stem diameter. While, wider spaced plants i.e. 2.0x1.5m (S3) gave significantly higher plant spread and stem diameter during both the years. Flower bud emergence, fruit set and fruit retention per plant were recorded significantly higher with wider spaced plants 2.0x1.5m (S3) in both the seasons of the years. Significantly higher per cent flower/ fruit drop was recorded with S1 (1.0x1.0m) treatment. While, minimum flower/fruit drop percentage was found with wider spacing i.e. 2.0x1.5m (S3) treatment in both the seasons and years. However, in high density spacings, winter season crop showed higher flower/ fruit drop percentage as compared to rainy season crop. Spacing treatments had significant effects on fruit yield. In general, rainy season crop gave higher yield as compared to winter season crop. Plant spacing treatment S3 (2.0x1.5m) gave maximum fruit yield per plant during both seasons and both the years. While minimum yield per plant was recorded with closer spaced plants i.e. 1.0x1.0m (S1). However, fruit yield on the basis of per hectare basis was found higher with close spaced 1.0x1.0m (S1) planting treatment during both seasons and years. Physico-chemical characteristics of the fruits i.e. mean fruit weight, size, volume, total soluble solids, ascorbic acid, total sugars, reducing sugar, non-reducing sugar and pectin content were observed better at wider spacing treatment 2.0x1.5m (S3). While, these quality characters were adversely affected with closer spacing treatment 1.0x1.0m (S1) during both seasons and both the years. The mean fruit weight, size, volume, total soluble solids, ascorbic acid, total sugars, reducing sugar, non-reducing sugar and pectin content were also observed higher in winter season than rainy season fruits during both the years. On the basis of experimental results, it was observed that winter season crop gave higher values of quality characters than rainy season crop.enplant density, spacing, growth analysis, yield components, guavas, Psidium guajava, horticulture, seasonal variationThesis