RESPONSE OF POTATO (Solanum tuberosum, L.) VARIETIES TO PLANTING DATES AND PLANT PROTECTION MEASURES FOR EARLY BLIGHT UNDER MIDDLE GUJARAT CONDITION

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dc.contributor.advisorPATEL, T. D.
dc.contributor.authorPATEL, CHANDUBHAI N.
dc.date.accessioned2018-05-14T07:32:32Z
dc.date.available2018-05-14T07:32:32Z
dc.date.issued1997
dc.description.abstractA field experiment was carried out on loauy sand soil of College Agronomy Farm, B.A. College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand to study the "Response of potato (Solanum tuberosum L.) varieties to planting dates and plant protection measures for early blight under middle Gujarat condition" during rabi 1995-96. Eighteen treatments comprising all possible combinations of three levels of planting dates (22nd November, 5th December and 21st December), two varieties (Kufri Badshah and Kufri Lauvkar) as well as three levels of mancozeb (0.2%) sprays (no spray, one spray at the time of appearance of the disease symptoms of early blight and two sprays of which one spray at the time of appearance of the disease symptoms of early blight and second spray at 15 days after first spray) were tried in split plot design with four replications. Planting dates were relegated in main plots and combinations of varieties and number of mancozeb (0.2%) sprays were allotted to sub-plots. During the period of investigation, the crop growth and yield attributes studied were plant emergence at 15 and 30 DAP, periodical plant height at 30,40,50,60 and 70 DAP, number of stems and leaves per plant, leaf area index, dry weight of top per plant and number and weight of tubers per plant at 50 DAP, early blight disease severity, number and weight of large, medium and small sized tubers as well as all grade tubers per five plants at harvest, tuber yield and economics for each of the factor and the treatments. The results indicated that number and weight of large and medium size tubers per five plants and total weight of all grades tubers per five plant at harvest were recorded the highest under D1 (22nd November) planting date but differences in values of these characters were not remarkable between Di (22nd November) and D2 (5th December) planting dates. However, tuber yield obtained under D1 (22nd November) was significantly recorded higher (18.48 t ha-1 M over that the crop planted on D2 (5th December) and D3 (21st December) planting dates. The planting date D2 (5th December) and D3 (2lst December) recorded 15.49 and 7.92 ha-1 . tuber yields. treatment D1 (22nd November) was found superior in recording the values of most of the growth and yield attributing characters such as plant height at 40,50, 60 and 70 DAP, leaf area index, dry weight of top and number of tubers per plant at 50 DAP, leaf area index, dry weight of top and number of tubers per plant at 50 DAP, The same treatment also recorded the least early blight severity over other planting dates. The maximum net return of Rs. 40578 ha- 1 was also obtained under the crop planted on D1 (22nd November) with CBR of 1:2.22. The variety V1 (Kufri Badshah) proved significantly superior over V2 (Kufri Lauvkar) in terms of tuber yield. The variety V1 (Kufri Badshah) gave significantly the highest tuber yield of 15.25 t ha-1. The variety V1 (Kufri Badshah) recorded significantly the highest plant height at 40,50,60 and 70 DAP, number of leaves, leaf area index and dry weight of top per plant at 50 DAP, least early blight severity, number and weight of large sized tubers as well as all grades tubers, weight of small sized tubers per five plants at harvest and tuber yield. On other hand, variety V2 (Kufri Lauvkar) only showed its significant superiority over Vi in respect of plant emergence percentage at 15 and 30 DAP. Variety V2 (Kufri Badshah) gave the net profit of Rs. 27003 ha-1 which was Rs. 8850 higher than variety V2 (Kufri Lauvkar). The variety V1 also gave the highest CBR of 1:1.79. Plant height at 70 DAP, early blight disease severity and tuber yield were remarkably influenced due to number of mancozeb (0.2%) sprays. Spraying level S2 (two spray) significantly increased plant height at 70 DAP and reduced disease severity of early blight and thereby increased tuber yield. The spray S2 (two spray) recorded significantly the highest tuber yield of 15.28 t ha-1 . Plant emergence at both periods of 15 and 30 DAP, plant height at 50 and 60 DAP, number of stems and leaves, leaf are index, dry weight of top, number and weight of tubers per plant at 50 DAP, and number and weight of small, medium and large as well as all grades tubers per five plants at harvest were significantly not altered due to number of mancozeb (0.2%) sprays. Treatment S2 (two spray) recorded maximum net return of Rs. 27318 ha-1 with CBR 1:1.81. During the course of investigation, the significant interaction between D x V was observed in plant emergence at 15 and 30 DAP, plant height at 40 DAP, leaf area index and dry weight of top per plant at 50 DAP, number and weight of small and all grades tubers per five plants at harvest as well as tuber yield. The interaction V x S and D X V X S were also observed significant in plant height at 60 and 70 DAP and leaf are index as well as number of medium sized tubers per five plants at harvest. Likewise, significant interaction was also observed between D x S, V X S, D x P, V X P and S x P in case of disease severity of early blight at 46, 56 and 76 DAP. The treatment combination D1V1S2 i.e. variety Kufri Badshah planted on 22nd November with two sprays of mancozeb (0.2%) ranked top in respect of tuber yield (23.33 t ha-1 M and net profit of Rs. 58703 ha-1.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810045450
dc.keywordsRESPONSE OF POTATO (Solanum tuberosum, L.), VARIETIES TO PLANTING DATES, PLANT PROTECTION MEASURES, EARLY BLIGHT UNDER MIDDLE GUJARAT CONDITIONen_US
dc.language.isoenen_US
dc.publisherAAU, Ananden_US
dc.research.problemRESPONSE OF POTATO (Solanum tuberosum, L.) VARIETIES TO PLANTING DATES AND PLANT PROTECTION MEASURES FOR EARLY BLIGHT UNDER MIDDLE GUJARAT CONDITIONen_US
dc.subAgronomyen_US
dc.subjectAGRONOMY, AGRICULTUREen_US
dc.subjectA STUDYen_US
dc.themeRESPONSE OF POTATO (Solanum tuberosum, L.) VARIETIES TO PLANTING DATES AND PLANT PROTECTION MEASURES FOR EARLY BLIGHT UNDER MIDDLE GUJARAT CONDITIONen_US
dc.these.typeM.Scen_US
dc.titleRESPONSE OF POTATO (Solanum tuberosum, L.) VARIETIES TO PLANTING DATES AND PLANT PROTECTION MEASURES FOR EARLY BLIGHT UNDER MIDDLE GUJARAT CONDITIONen_US
dc.typeThesisen_US
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