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Browsing Thesis by Author ".Gurav, Dr.S.B"

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    "STUDY OF VARIATIONS IN CANOPY TEMPERATURE AND LIGHT USE EFFICIENCY DUE TO DIFFERENT FERTILIZER LEVELS IN GERBERA UNDER POLYHOUSE CONDITIONS IN KHARIF SEASON"
    (MAHATMA PHULE KRISHI VIDYAPEETH Rahuri-413 722 (Maharashtra), 2008-07-23) YOGRAJ, KHEDIKAR SHIRISH; Salunke, Prof. S. S.; . Sabale, Dr. R. N; Hazari, Prof. A.K.; .Gurav, Dr.S.B; Chougale, Shri A.A
    The research experiment was conducted in the Hi - tech Floriculture and Vegetable Project, College of Agriculture, Pune-5 during the kharif season at 2007 entitled as "Study of variations in canopy temperature and light use efficiency due to different fertilizer Levels in gerbera (Gerbera jamesoni L.) under polyhouse conditions in Kharif season". Experiment was laid in a randomized block design with six treatments and four replications. The treatments under study were Ti (Control) (No fertilizer), T2, (NPK @ 15:5:45 mg/pl/week), T3, (NPK @ 20:10:55 mg/pl/week), T4, (NPK @ 25:15:65 mg/pl/week), T5, (NPK @ 30:20:75 mg/pl/week), T6, (NPK @ 35:25:85 mg/pl/week). The results indicated that various biometric observations like highest plant height (37.2 cm), highest plant spread (54.7 cm), highest number of suckers per plant (5.4), lowest days taken to initiate first flower bud (58.3 days), lowest day taken to initiate first flower 88.7, the minimum number of days (96.8) for 50 per cent flowering and the maximum flower diameter (14.4 cm) were found to be superior under highest level of fertilizer T6; (NPK @ 35:25:85 mg/pl/wk). Weekly average incident radiation ranged between 294 umolm s" and 1143 umolm s" were recorded under polyhouse and in open field condition respectively. Weekly average reflected radiation ranged between 27.77 umolm s" and 97.07 umolm s" were recorded under polyhouse and in open field condition. It can be concluded that reflected radiation decreases as the fertilizer levels increases. This may be due to more vegetative growth under increasing fertilizer levels which causes more absorption of PAR radiation. Weekly average transmitted radiation ranged between 150 umolm s" and 1 I 206.2 umolm s" were recorded under polyhouse and in open field condition. The transmitted radiation decreases as the fertilizer levels increases. This may be due to more vegetative growth under increasing fertilizer levels, which causes more absorption of PAR radiation. Weekly average absorbed radiation ranged between (178.8 umolm s" ) in T6 (NPK @ 35:25:85 mg/pl/wk) radiation under polyhouse. Absorbed radiation 0 1 of 1226 jxmolm s" was recorded in open field condition. It can be concluded that absorbed radiation increases as the fertilizer levels increases. This may be due to more vegetative growth under increasing fertilizer levels, which causes more absorption of PAR radiation The value of absorptivity (%) viz., 69.6 maximum, 61.61 minimum, 65.61 average and 8 range were found at T6 level i.e. NPK @ 35:25:85 mg/pl/week under polyhouse. Canopy temperature was recorded at weekly intervals. Canopy temperature (Tc) 42.1 maximum, 28.6 minimum, 35. average and 13.5 range were found at T6 level i.e. NPK @ 35:25:85 mg/pl/week under polyhouse. Whereas lower canopy temperature was observed in control (no fertilizer application) (Ti) (39°C). Further it was revealed from Table.25 that canopy temperature (Tc) under polyhouse were always lower than the open field conditions (44.5 °C). Canopy air-temperature differential was also recorded at weekly intervals. There is no significant difference in canopy air-temperature differential among all the levels. The highest average negative value (-4.85 °C) in control (no fertilizer application) (Ti). Where as lowest average negative value (-3.7 °C) observed at T6 NPK @ 35:25:85 mg/pl/wk. The highest green weight light use efficiency (6.04 g/MJ) and dry weight light use efficiency (1.65 g/MJ) was observed in T6 level i.e. NPK @ 35:25:85 mg/pl/week under polyhouse.