PROBLEM TO BE SOLVED: To provide a water-retaining material for plant-cultivation with which water retention is maintained even in summer season and/or at a dry area having a small amount of rainfall, and which does not inhibit the growth of plant and to provide a plant cultivation method.SOLUTION: The water-retaining material for plant-cultivation is obtained by putting a sheet-like water-resistant paper (A) and a sheet-like water-permeable paper (B) together, and has water-absorbing resin (C) between (A) and (B). The sheet-like water-resistant paper (A) is such that: a sizing degree measured by the Stockigt method specified in JIS P 8122 is 1.0-110 s, and wet breaking strength (transverse direction) measured in conformity to JIS P 8135 is 0.007-0.4 kN/m. The sheet-like water-permeable paper (B) is such that: a sizing degree measured by the Stockigt method specified in JIS P 8122 is &le15 s, and wet breaking strength (transverse direction) measured in conformity to JIS P 8135 is &le0.4 kN/m.COPYRIGHT: (C)2012,JPO&INPIT【課題】夏場や降雨量の少ない乾燥地帯でも、保水性が保たれ、且つ植物の生育を阻害しない植物栽培用保水材の提供と栽培方法を提供することを目的とする。【解決手段】シート状の下記耐水紙(A)とシート状の透水紙(B)とを合わせてなる植物栽培用保水材であって、(A)と(B)との間に吸水性樹脂(C)を有する植物栽培用保水材。耐水紙(A):JIS P 8122を用いて測定したステキヒト法によるサイズ度が1.0~110秒であり、且つ、JIS P 8135を用いて測定した湿潤引張強さ(横方向)が0.007~0.4kN/mである耐水紙。透水紙(B):JIS P 8122を用いて測定したステキヒト法によるサイズ度が15秒以下であり、且つ、JIS P 8135を用いて測定した湿潤引張強さ(横方向)が0.4kN/m以下である透水紙。【選択図】なし
