Effect of Plant Growth Regulators on the Dry Matter Productivity in Green Fodder Sorghum (Sorghum bicolor MOENCH)

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  • SHEN Yixin
    Faculty of Agriculture, Miyazaki University:(Present office)Department of Animal Science, Nanjing Agricultural University
  • ISHII Yasuyuki
    Faculty of Agriculture, Miyazaki University
  • ITO Koji
    Faculty of Agriculture, Miyazaki University
  • NUMAGUCHI Hirotsugu
    Faculty of Agriculture, Miyazaki University

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Other Title
  • 植物生長調節剤処理が青刈用ソルガム(Sorghum bicolor MOENCH)の乾物生産性に及ぼす影響
  • ショクブツ セイチョウ チョウセツザイ ショリ ガ アオガリヨウ ソルガム S

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Abstract

The objective of this study was to examine dry matter (DM) productivity and lodging-resistance in multi-cutting green fodder sorghum sprayed with three plant growth regulators (PGRs), namely, gibberellin (GA), cycocel (CCC), and α-naphtyl acetate (NAA). The first crop was harvested at the end of July and the second crop at the middle of September immediately after the attack of a typhoon, respectively. The third crop was harvested at the end of November after the first frost. Direct effects of PGRs were examined in the first and second crops by spraying PGRs and the after-effect of PGRs was examined in the third crop without spraying to it. DM yield was increased by GA and decreased by CCC in the first and second crop. On the contrary, it was decreased by GA and increased by CCC in the third crop. Thus, after-effects of GA and CCC were different from the direct effects of those on DM yield. NAA increased DM yields of three crops. In the first and second crops, leaf area index (LAI) was slightly increased and extinction coefficient (K) was decreased by GA and NAA treatments. The decrease of K was due to the increase of plant height by GA treatment and stem inclining by NAA treatment. Therefore, GA and NAA treatments increased crop growth rate (CGR) in the first and second crops through increasing net assimilation rate (NAR). In the third crop, CGR increased by the after-effect of both CCC and NAA, possibly due to the increase of LAI in CCC plot and due to the increase of LAI and NAR in NAA plot. The former was assumed to be due to the enhancements of the tillering and the leaf area enlargement under cooler temperature. The latter was assumed to be due to the strengthening of apical dominance, which caused a fewer but larger tillers. The lodging resistance under typhoon was increased by NAA treatment. This was assumed to be due to shorter internodal lengths and more nodal root's numbers in NAA plot. Thus, the annual DM yield was increased by both GA and NAA treatments. Especially in a extra plot, sprayed with NAA and grown without cutting at the middle of September, annual DM yield was 1.9 times as much as that in control plot.

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