Effects Of Soil Conditioners On Soil Structure Of Sandy Soil And Silty Loam

Nutritional and drought-resistant water-retaining agent (NDWA), Wote absorbent (WA) and winter wheat (Bainongaikang58) as materials, the effect of different absorbents on soil physics, soil aggregates of sandy loam and sandy, soil pore and biomass and yield of winter wheat are systematically researched, and discuss the impacts of water-retaining agent on water conservation and soil improvement. The main conclusions are suggested as follows:1,There is significant effect of 45 kg.ha-1 of NDWA and 60 kg.ha-1 of WA on water conservation. Compared with sandy soil, NDWA increase soil moisture more prominently at jointing and maturity stage, but water moisture of two soil decreases at booting stage. Meanwhile, there is important effect of WA on soil moisture. What's more, water-retaining agent can increase soil saturated water content and holding water capacity.2,The analysis of the impact of water-retaining agent on soil structure property shows that: with the increase of the NDWA, the bulk weight of sandy loam and sandy soil decrease by 3.4% and 4.3% than no water-retaining agent respectively; the bulk weight of sandy soil with the WA decrease, but there is no obvious change with sandy loam. On soil aggregate, the NDWA remarkably increases the content of sandy loam and sandy soil of 0.25-0.5mm particle size aggregate. The trend of the content of 0.25-0.5mm particle size aggregate at jointing stage, booting stage and maturity stage increases firstly and then decreases. The WA remarkably influences the sandy soil of 0.25-0.5mm particle size aggregate and enlarges along with the increase of dosage. Also the content of sandy soil aggregate rises.3,Through the CT scanning analysis showing that there are significant impacts of two absorbent agent on characteristics of soil pore distribution such as soil pore number, porosity, pore round rate and so on, and there is better effect of NDWA compared with WA. During all stages of winter wheat, NDWA improve soil pore number, porosity and pore round rate and with the increase of NDWA, they improving evidently, best one is 45kg.ha-1 of NDWA. The treatment with 15kg.ha-1 of WA decrease soil pore number and porosity in three stages, but increasing soil pore number and porosity of 0.5-8mm to sandy soil. The NDWA increase soil porosity of 0.5-8mm to sandy loam in three stages, while there is same result for WA in jointing and maturity stage, but soil porosity is decreased by the WA at booting stage except treatment 9. Meanwhile, the NDWA can improve soil pore area and decrease pore round rate in three stages, while high dosage of the WA promote soil pore area and it is reverse in the lower dosage of the WA.4,The role of the ultimate merits of absorbent agent is reflected in changes in production and biomass on, during the booting and maturity stages NDWA affected biomass of wheat grown in both soil types, increased by 20.5%, 17.8% of sandy soil, increased by 18.1%, 11.3% of silty loam, the effects on wheat grown in sandy soil were more pronounced; WA affects on biomass of wheat in sandy soil were more pronounced, but the effects on biomass of wheat in silty loam showed no discernible patterns. NDWA application boosted wheat yield of both soil, wheat yield of sandy soil increased 10.2%-60.2%, wheat yield of silty loam increased 8.9%-47.6%, the effects were positively correlated with dosage, peaking at 45 kg. ha-1. WA on saving absorbent and nutrition there is a systematic trend, With the increased use of winter wheat yield of sandy soil increased, more nutrition saving Agent small, silty loam no rules to follow.To sum up , both water-retaining agent products can improve silty loam and sandy soil, the effects are generally positively correlated with dosage, best one was achieved at 45kg. ha-1. Sandy soil was improved more markedly than silty loam. NDWA was more effective than WA.