Fertilizer composition comprising a zeolite and basic L-amino acid

A growth-supporting material, which material comprises a mixture of a medium comprising peat, clay, sand and/or soil for plant growth and a fertilizer composition comprising at least one zeolite, into the pores of which at least one basic L-amino acid has been adsorbed, optionally together with other growth-promoting components, wherein the zeolite(s) has a charge of about 1-3% of nitrogen originating from said basic L-amino acid(s), calculated per total weight of charged zeolite, and wherein release of nitrogen from the fertilizer composition is controlled by a plant cultured in the medium.

A method of promoting the growth of a seedling, which method comprises

• a) applying a fertilizer composition to roots of the seedling, the fertilizer composition comprising at least one zeolite, into the pores of which at least one basic L-amino acid has been adsorbed, wherein the zeolite(s) has a charge of about 1-3% of nitrogen originating from said basic L-amino acid(s), calculated per total weight of charged zeolite, and
• b) planting the seedling to which the fertilizer composition has been applied in a growth medium comprising peat, clay, sand, and/or soil,
• wherein release of nitrogen from the fertilizer composition during subsequent culture of the seedling planted in the growth medium is controlled by the seedling in the growth medium.

A method of promoting the growth of at least one plant, which method comprises

• a) providing a plant planted in a growth medium comprising peat, clay, sand, and/or soil, and
• b) applying a fertilizer composition to the growth medium in which the plant is planted, the fertilizer composition comprising at least one zeolite, into the pores of which at least one basic L-amino acid has been adsorbed, wherein the zeolite(s) has a charge of about 1-3% of nitrogen originating from said basic L-amino acid(s), calculated per total weight of charged zeolite,
• wherein release of nitrogen from the fertilizer composition during subsequent culture of the plant planted in the growth medium is controlled by the plant.