Effects of Fertilization Level on the Regrowth of Orchardgrass : I. Changes of yield and growth with time

DOI JASI Web Site 4 Citations

Bibliographic Information

Other Title
  • オーチャードグラスの再生に及ぼす追肥量の影響 : I.再生に伴う生育状態の推移
  • オーチャードグラスの再生に及ぼす追肥量の影響-1-再生に伴う生育状態の推移
  • オーチャードグラス ノ サイセイ ニ オヨボス ツイヒリョウ ノ エイキョウ

Search this article

Abstract

Orchardgrass sward of the 2nd harvest year managed in low fertilization level received 3 levels of fertilization after the 1st cut or the 2nd cut, respectively. The levels were high: 80kg N+40kg P_2O_5 +70kg K_2O/ha, Medium: 40kg N+20kg P_2O_5+35kg K_2O/ha, and low: 20kg N+10kg P_2O_5+17.5kg K_2O/ha. Clipped part (cut at 6cm), stubble and root of swards were harvested at weekly intervals up to 8 weeks for each regrowth, and leaf and stem were divided into living and dead matter. The dry weight, plant height, number of tillers, LAI, percentage light penetration and TNC in stubble were measured at weekly intervals. Changes of measured values in yield and growth with time were well fitted by the cubic regression curves. In the early stage of regrowth, yield, LAI, plant height and number of tillers increased more rapid with the increment of fertilizer, and percentage light penetration was decreased to 5% in about 3 weeks for high, in about5 weeks for medium, and in about 8 weeks for low level of fertilization. Living yield changed to decline in about 6weeks for high level of fertilization, as dead matter of clipped part began to increase in about 5 weeks and the increase was accelerated with the increment of fertilizer. Percentage TNC in stubble was decreased and the recovery was retarded with the increment of fertilizer. Maximum stages of average productivity (suitable cutting stages in theory) for regrowth after the 1st cut and the 2nd cat were 4.4 and 4.5 weeks for high, 4.5 and 4.8 weeks for medium, and 3.5 and 3.9 weeks for low level of fertilization, and the average productivity (yield of living matter/regrowth duration) were 9.0 and 7.8g/m^2/ day for high, 6.4 and 5.3g/m^2/day for medium, and 4.6 and 3.8g/m^2/day for low level of fertilization, respectively. For high level of fertilization, plant height, LAI and percentage light penetration at maximum stages of average productivity were similar to the corresponding values in previous paper (plant height 74cm, LAI 7.4, light penetration 1%), but for medium and low levels of fertilization, the values were not conform to them. The results described above suggest that cutting in the suitable stage of orchardgrass sward is essential to obtain the high yield of living matter, especially for the high level of fertilization.

Journal

Citations (4)*help

See more

Details 詳細情報について

Report a problem

Back to top