| Since moisture is the major limitation to plant growth in arid and semi-arid regions, Absorbant agent becomes one of the important materials of afforestation in arid regions for its characteristics of super absorbent and slow-release ability as well as improving water use efficiency. Orthogonal test of four factors at three different levels was designed in this study, with four factors as three species seedlings (i.e. Simonii, Prunus sibirica, and black locust), insurance agent and two new materials including Polyaspartic acid and tombarthite, which are often used in the drought-resistant afforestation. The objective is to provide an insight into the impacts of these factors as well as there various composites on the growth and biology indices of plant on the arid condition, thus providing elementary experimental studies and a basis for further researches on new materials application of afforestation in arid regions.Results showed that comparing with blank control group, all insurance agent, Polyaspartic acid and tombarthite have improved the plant adaptability to arid environment, as well as plant growth and biology indices. Beside, these three materials all have a suitable range of dosage. Insurance agent didn't promote the plant growth significantly (p>0.05) within the dosage range of 5-10 g per plant, while Polyaspartic acid within the dosage range of 2-6 g per plant. Tombarthite was significantly conducive to plant biology indices. Within the range of 3-6 g per plant, tombarthite had little different effects on plant growth and biology indices, while the promoting effect became significant when the dosage was up to 9g. It was also shown that effects of different composites of the three materials on plant growth differed. With the consideration of optimum improvement of plant growth, the optimal choice for Simonii is composite 7, for Prunus sibirica is composite 5, and for black locust is composite 3.
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