Abstract: According to the agricultural practicality of Inner Mongolia and the application prospect of super absorbent polymer(SAP),it was meaningful to do researches on the effect of SAP concentration on the seedling establishment under drought condition.The effects of application concentration under different applying method of SAP on the emergence and the growth of radish,corn and proso were researched in this paper.The results indicated that applying SAPs in soil increased emergence and seedling growth of 3 crops,the increases in emergence and seedling growth depend on application method and depth.At 5 cm depth of applying SAPs,spreading SAPs in furrow increased the emergence rate of radish by 25.3 to 44 percentage points compared with CK at the concentration of 0.10 % to 0.50 %.Mixing SAPs with soil can also increased the emergence at the concentration less 1.00 %,but extent of increase was much more less that in spreading SAPs in furrow.At 10 cm depth of applying SAPs,mixing SAPs with soils increased emergence by about 30 percentage points at the concentration of 0.10 % to 0.50 % while spreading SAPs in furrow did not increased compared with CK.Mixing SAPs with soils increased emergences of corn and proso by 5-7 times and 2-4 times respectively at the concentration less than 0.30 %.The effect of mixing SAPs with soils on seedling growth was more obvious than on the emergence.The plant heights were remarkably higher than CK for radish at 0.10 % concentration and for corn and proso at 0.10 % to 0.30 % concentration.On whole mixing SAPs with soils was better than spreading SAPs in furrow,but applying SAPs at depth of 10 cm was better than 5 cm for radish while mixing SAPs with soil applying depth of 5 cm was better than that of 10 cm for either emergence or seedling growth of corn and proso.The difference caused by the interactivities between SAPs and soils.

Key words: Super absorbent polymer, Crop, Seedling emergence rate

CLC Number: 

• S318