Soil water-holding agent is a kind of material for water saving developed in recent years.The agents of LT 200

LT-100(made in San-yan Ind ust rial Company

Japan)

Huang-guan and Bo-ya were tested in field experiments to study the effects of different soil water-holding agents on spring wheat plant

tree transplant

and tree seeding raising.Results showed that in the experiment of spring whea t plant

LT- 200

LT-100

H uangguan and Boya increased yields by 13.60%

11.43%

4.13%and 3.52%

respectively

with the average of 8.17%.They increased water use eff iciency by 1.00

0.84

0.31 and 0.26 kg/ mm ? hm2

respectively

compared with controls(field without adding soil water-holding agents).Especially

the increases by adding LT-200 and LT 100 agents were significant. At same time

LT-200

LT- 100

Huangguan and Boya enhanced soil water storage in 120 cm depth by 27.64

26.92

14.04 and 13.82 mm

respectively

compared with cont rols in spring wheat planting experiment.Soil water-holding agents couldincrease the dry root weight of spring wheat

but the increases were insignificant.Effects of different soil water-holding agents on tree transplant and tree seeding raising in one year growth were limited.Applied methods and the amount of soil water-holding agents added to soil need further studies.