00225603

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スイデン テンカンバタ ニオケル シリョウ セイサン ダイ1ポウ トウモロコシ ノ セイイク シュウリョウ ニ オヨボス ジュクセイ ハイスイ システム オヨビ サイバイ ミツド ノ エイキョウ

Production of Forage Crops in the Temporary Upland Field. I : Effect of Hybrid Maturity, Underdrainage System and Planting Density on the Growth and Yield of Forage Maize

Japanese (日本語)

神戸大学農学部研究報告

17(2)

181-189

神戸大学農学部

1987

2006-09-15

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

The purpose of this experiment was to clarify the effect of hybrid maturity, underdrainage system and planting density on the growth and yield of forage maize (Zea mays L.) grown on the level row in the temporary upland field (heavy clay soil). Treatments included two hybrids, extremely early (P3732) and early maturitiy (P3432); four underdrainage systems which were constructed by combining main hull drain, 10 and 20m in spacing and 60cm in depth, with supplementary mole drain intersecting perpendicularly to the main drain, 1 and 2m in spacing and 30cm in depth; and three planting densities, 4.6,6.2 and 9.3 plants/m^2,with inter-row spacing of 70cm, refered to as low, medium and high, respectively. Two seeds per hill were sown on 26 April and thinned to a plant per hill on 21 May. Main effects of the treatments were significant for the following characters at harvesting time. Plant height, culm length, number of leaves on main culm and bearing height of ear were in the order of early>extremely early maturing hybrid. Weight of 100 grains, dry grain weight per ear, ratio of dry weight of grains to total top dry weight, TDN% and dry grain yield per unit area were in the order of extremely early>early maturing hybrid. All of the characters described above, number of green leaves per plant, number of grains per ear, total top dry weight per plant and yield of total top dry matter and TDN per unit area were greater in the two systems with main drain spacing of 10m than in those with main drain spacing of 20m. And in the systems of 10m in main drain spacing, plant height and culm length were greater in the system of 2m than in that of 1m in supplementary drain spacing. But in the systems of 20m in main drain spacing, plant height, culm length, number of grains per ear, dry grain weight per ear, total top dry weight per plant, and yield of dry grain and TDN per unit area were greater in the system of 1m than in that of 2m in supplementary drain spacing. Plant height, culm length, number of grains per ear, dry grain weight per ear and total top dry weight per plant were in the order of low>medium>high planting density. Number of leaves on main culm was in the order of low and medium>high planting density. Weight of 100 grains was in the order of low>high planting density. Total top dry matter yied per unit area was in the order of high>low planting density. Yield of dry grain and TDN per unit area were in the order of high and medium>low planting density. And the greatest yield of dry grain and TDN per unit area were obtained in low planting density under poor drainage.

紀要論文