PATEL, J. J.PRAJAPATI, MUKESH N.2018-05-212018-05-212004http://krishikosh.egranth.ac.in/handle/1/5810046810A field experiment was conducted during summer season of the year 2003 at the College Agronomy Farm, Anand Agricultural University, Anand to study the "Influence of different irrigation schedules (IW : CPE ratio) and growth regulators on growth and yield of summer greengram {Phaseolus radiatus L.) under middle Gujarat condition". The soil of the experimental plot was loamy sand in texture having good drainage, low in nitrogen, medium in available phosphorus and high in potash with pH 7.5. Sixteen treatment combinations consisting of four levels of irrigation schedules (IW : CPE ratio) viz., Io - Control- critical growth stages, I1 - 0.4 IW : CPE ratio, I2 - 0.6 IW : CPE ratio and I3 - 0.8 IW : CPE ratio and four growth regulators viz., control-water spray (GRo), cycocel @ 100 ppm, first at 25 and second spray at 35 DAS (GR1), NAA @ 25 ppm at initiation of flowering(GR2) and IB A @ 25 ppm at initiation of flowering (GR3) were tested under split plot design with four replications. The results indicated that the seed and dry fodder yield as well as most of the growth arid yield attributes of summer greengram were significantly influenced due to different irrigation schedules. The results further revealed tihat treatment I3 (0.8 IW : CPE ratio) recorded significantly higher av. plant height at 20, 40, 60 DAS and at harvest, av. nximber of branches per plant, leaf area index at 20,40 DAS and at harvest, av. number of flowers per plant, av. number of pods per plant, av. number of seeds per pod, av. pod length (cm), test weight (1000 - grain weight in gm) and av. seed yield per plant. Treatment I3 (0.8 IW : CPE ratio) secured the highest seed yield (1603 kg ha-1) and dry fodder yield (2644 kg ha-1) of summer greengram. The seed and dry fodder yield increase under the same treatment was to the tune of 134.01 and 44.71 per cent respectively over treatment Io (Control- critical growth stages). The consumptive use of water was increased with increase in IW : CPE ratio whereas, the water use efficiency and water expense efficiency were higher with lower IW : CPE ratio. The highest value of net ICBR (1: 17.36) was observed under treatment I1 (0.4 IW : CPE ratio), followed by treatment I3 (0.8 IW : CPE ratio) with net ICBR of 1: 8.62. The lowest net ICBR ( 1 : 7.40) was noticed under treatment I2 (0.6 IW: CPE ratio). Among the various growth regulators, application of NAA @ 25 ppm at initiation of flowering (GR2) resulted in the maximum growth and yield attributes and protein content which ultimately resulted in higher seed and dry fodder yield of summer greengram. Application of NAA @ 25 ppm at initiation of flowering (GR2) secured significantly the highest seed yield (1392 kg ha-1) and dry fodder yield (2251 kg ha-1). The seed and dry fodder yield increase under the same treatment was to the tune of 44.24 and 14.72 per cent respectively over treatment GRo (Control- water spray). Apart from this, application of NAA @ 25 ppm at initiation of flowering (GR2) secured the highest consumptive use of water, water use efficiency and water expense efficiency. The highest value of net ICBR 1: 53.38 was observed under the same treatment. During the course of investigation, interaction effect of irrigation and growth regulators revealed that treatment combination of 0.8 IW : CPE ratio along with application of NAA @ 25 ppm at initiation of flowering recorded significantly higher av. number of pods per plaint (33), av. pod length (9.80cm), av. seed yield per plant (9.43 g) and ultimately secured the highest seed yield (2250 kg ha-1). For securing higher seed yield and net realization from summer greengram crop cv. GM- 4 raised on loamy sand soils of middle Gujarat, it is advisable to apply ten irrigations, 2nd irrigation of 25 m depth and rest of irrigations, each of 50 mm depth to be scheduled at an IW : CPE ratio of 0.8. The first irrigation should be applied immediately after sowing, second at seven days after first irrigation and remaining irrigations at an interval of seven days with application of NAA @ 25 ppm at initiation of flowering, 38 DAS for securing high seed yield and maximum net realization over control i.e. water spray.enAGRONOMY, AGRICULTUREA STUDYThesis