Plant growth promoter

Abstract

The present invention is a plant growth promoter containing a lignocellulosic biomass, wherein the lignocellulosic biomass has a lignin content of 40% by mass or more and 60% by mass or less and a contact angle with water of 50° or less.

1 . A plant growth promoter comprising a lignocellulosic biomass, wherein the lignocellulosic biomass has a lignin content of 40% by mass or more and 60% by mass or less and a contact angle with water of 50° or less. 
     
     
         2 . The plant growth promoter according to  claim 1 , wherein the lignocellulosic biomass is a biomass from a Palmae plant. 
     
     
         3 . The plant growth promoter according to  claim 1 , wherein the lignocellulosic biomass has an average particle size of 1,000 μm or less. 
     
     
         4 . A method for producing a plant growth promoter as claimed in  claim 1 , the method comprising a step of hydrophilically treating a lignocellulosic biomass. 
     
     
         5 . The method for producing a plant growth promoter according to  claim 4 , wherein the hydrophilic treatment is an alkali treatment, a hot water treatment, an acid treatment, or a combination thereof. 
     
     
         6 . The method for producing a plant growth promoter according to  claim 4 , wherein the hydrophilic treatment is performed in a medium containing water. 
     
     
         7 . The method for producing a plant growth promoter according to  claim 4 , wherein the lignocellulosic biomass before the hydrophilic treatment has a lignin content of 40% by mass or more and 60% by mass or less. 
     
     
         8 . The method for producing a plant growth promoter according to  claim 4 , wherein the lignocellulosic biomass having a contact angle with water of 50° or less is obtained by the hydrophilically treating step. 
     
     
         9 . A method for growing a plant, wherein the plant is cultivated in a soil containing the plant growth promoter according to  claim 1 . 
     
     
         10 . The method for growing a plant according to  claim 9 , wherein the plant growth promoter is added to the soil before sowing. 
     
     
         11 . The method for growing a plant according to  claim 9 , wherein the plant growth promoter is mixed into the soil or sprayed onto the soil. 
     
     
         12 . The method for growing a plant according to  claim 9 , wherein the plant growth promoter is added, in terms of the lignocellulosic biomass, in an amount of 0.0001 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the soil for cultivating the plant. 
     
     
         13 . The method for growing a plant according to  claim 9 , wherein the plant growth promoter is sprayed, in terms of the lignocellulosic biomass, in an amount of 0.2 kg or more and 20,000 kg or less per 10a of the soil for cultivating the plant. 
     
     
         14 . The method for growing a plant according to  claim 9 , wherein the plant is a plant used as an agricultural crop. 
     
     
         15 . The method for growing a plant according to  claim 9 , wherein the plant is a plant selected from Cucurbitaceae, Solanaceae, Rosaceae, Malvaceae, Leguminosae, Gramineae, Brassicaceae, Alliaceae, Amaryllidaceae, Compositae, Amaranthaceae, Umbelliferae, Zingiberaceae, Lamiaceae, Araceae, Convolvulaceae, Dioscoreaceae, and Nelumbonaceae. 
     
     
         16 . The method for growing a plant according to  claim 9 , wherein the plant is a plant selected from fruit and vegetables, leaf vegetables, root vegetables, rice, wheat varieties, and flowers. 
     
     
         17 . The method for growing a plant according to  claim 9 , comprising aggregating the soil to obtain a soil granulated material.