Optimum Planting Density and Fertilizer Application Rate of Forage Rice under Ratoon Cropping in the Central Kyushu Region

Kobayashi Ryoji, Sato Kenzi, Hattori Ikuo, Konishi Tatsuya

doi:10.14941/grass.53.208

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九州中部地域の水田における2回刈り飼料イネ栽培の最適密度および施肥量の実証的解明
キュウシュウチュウブチイキノスイデンニオケル 2カイガリシリョウイネサイバイノサイテキミツドオヨビセヒリョウノジッショウテキカイメイ

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Abstract

A four-year study was conducted to investigate the dry matter yield and nitrogen budget of ratoon-cropped forage rice on farm fields receiving 300kg/a manure, under various combinations of planting densities (18-80 plants/m^2) and chemical fertilizer rates (conventional=1.7 kg N/a, 1.1 or 1.3 kg P_2O_5/a, 1.1 or 1.3kg K_2O/a ; high =2.6 kg N/a, 1.3kg P_2O_5/a, 1.3kg K_2O/a). Rice plants were transplanted using a conventional rice planter (18-27 plants/m^2), a zigzag planter (40 plants/m^2) or a zigzag planter plus manual planting (80 plants/m^2). The annual dry matter yield over two harvests was the highest at a density of 40 plants/m^2, and increased as the chemical fertilizer rate increased, exceeding 200kg/ a when climatic conditions during the cultivation period favored plant growth. This high yield (200kg/a) was achieved by allowing plants to absorb more than 2.4kg N/a, which required application of chemical fertilizer N equivalent to more than 2.9 times that used in conventional cultivation for grain rice, in addition to 300kg/a manure.

Journal

Japanese Journal of Grassland Science

Japanese Journal of Grassland Science 53 (3), 208-214, 2007

Japanese Society of Grassland Science

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