Sandooja, J.K.Lamba, Ishu2016-11-172016-11-172008http://krishikosh.egranth.ac.in/handle/1/86019An experiment was conducted with six pigeonpea genotypes namely Paras, ICPL-88039, H2000-37, H2000-47, H2001-4,and H2001-37, at different levels of phosphorus i.e. 15%, 30%, 60% and 100% in pot culture house. Various parameters like fresh and dry weight of root and shoot, leaf area, photosynthetic rate, total chlorophyll content, total phosphorus content of root and shoot, total nitrogen content of root and shoot, fresh weight of nodules, leghaemoglobin content, acetylene reduction activity, yield and its attributing characters were analysed at three sampling stages i.e. 45, 75 & 110 days after sowing. Another experiment was conducted in laboratory with four pigeonpea genotypes i.e. H2001-37, Paras, H2000-37 and ICPL-88039 with same treatments of phosphorus. However, the parameters studied were root length, number of root hairs, root-shoot ratio and alkaline phosphatase activity only 10 days after sowing  Maximum fresh wt. of the root was observed in ICPL-88039 and minimum fresh weight was observed in H2001-37, whereas maximum fresh weight of shoot was observed in H2000-37 genotype and minimum was in Paras genotype.  Dry weight of root was maximum in H2001-27 whereas dry weight of shoot was maximum in H2000-37. Minimum root was observed in H2001-37 genotype whereas minimum dry weight of shoot was observed in Paras genotype.  Photosynthetic rate, chlorophyll content, leaf area was maximum in Paras genotype (Check variety). However, total phosphorus and nitrogen content at low phosphorus application was better in H2000-37 genotype.  Nodule weight, acetylene reductase activity, leghaemoglobin content was high in Paras & H2001-37 genotype. However at lower P application H2001-37 performed better. In second experiment, at low phosphorus application maximum root length was observed in H2000-37 where number of root hairs were highest in H2001-37 genotype. Phosphatase activity was highest in H2001-37 genotype at low phosphorus application.enGenotypes, Vegetative propagation, Planting, Pigeonpeas, Sowing, Root nodulation, Drying, Enzymes, Yields, NitrogenThesis