Effects of Water Temperature on Soil Water Infiltration Characteristics Under Film-Mulched Drip Irrigation

Mulched drip irrigation has been widely used in agricultural planting in arid and semi-arid regions. The dynamics and distribution of soil salinity under mulched drip irrigation greatly affect crop growth and yield. However, there are still different views on the distribution and dynamics of soil salinity under long-term mulched drip irrigation due to complex factors (climate, groundwater, irrigation, and soil). Therefore, the soil salinity of newly reclaimed salt wasteland was monitored for 9 years (2008–2016), and the effects of soil water on soil salinity distribution under mulched drip irrigation have also been explored. The results indicated that the soil salinity decreased sharply in 3–4 years of implementation of mulched drip irrigation, and then began to fluctuate to different degrees and showed slight re-accumulation. During the growth period, soil salinity was relatively high at pre-sowing, and after a period of decline soil salinity tends to increase in the late harvest period. The vertical distribution of soil texture had a significant effect on the distribution of soil salinity. Salt accumulated near the soil layer transiting from coarse soil to fine soil. After a single irrigation, the soil water content in the 30–70 cm layer under the cotton plant undergoes a ‘high–low–high’ change pattern, and the soil salt firstly moved to the deep layer (below 70 cm), and then showed upward migration tendency with the weakening of irrigation water infiltration. The results may contribute to the scientific extension of mulched drip irrigation and the farmland management under long-term mulched drip irrigation.

Download Full-text

Field Experimental Study on Saline and Alkaline Soil Amelioration through Combining Chemical Method and Under-Mulch Drip Irrigation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.599.832 ◽

2012 ◽

Vol 599 ◽

pp. 832-837

Author(s):

Chun Xia Wang ◽

Quan Jiu Wang ◽

Zhuang Liang

Keyword(s):

Soil Water ◽

Drip Irrigation ◽

Salt Content ◽

Soil Bulk Density ◽

The Other ◽

Water Infiltration ◽

Alkaline Soil ◽

Soil Salt Content ◽

Soil Water Infiltration ◽

Reduced Rate

Chemistry amelioration measure is a means of regulating soil water and salt movement, the paper introduced the method of combined the under-mulch drip irrigation with applying of chemicals, such as PAM, Handilong and Gypsum. The Field experimental results indicate that the surface soil bulk density reduced degree for applying chemistry matters is higher than without applying chemical farmland (as comparison treatment), the reduced rate shows to reduce one after the other increase with applying increasing. The holding water capacity for applying chemicals is higher than comparison treatment except the treatments for applying Handilong (3750Kg•ha-1) and Gypsum (5340Kg•ha-1), and the holding water effect applying PAM is the highest and the lowest for Gypsum. Applying chemicals also increases the soil water infiltration depth, and the soil water is held within 0-60cm soil layers for applying chemical soils and 0-40cm for comparison treatment. The desalinization rate is lowest for comparison treatment, the desalinization effect is biggish in upper initial soil salt content, and the highest for applying Handilong and the lowest for Gypsum. The output is lowest in comparison treatment, it reduces for applying PAM as applying increased, but to reduce one after the other increase with applying Handilong and Gypsum increasing.

Download Full-text

Comparative study of the impact of two mechanical perforation densities on the behavior of a sandy soil

Progress in Agricultural Engineering Sciences ◽

10.1556/progress.8.2012.2 ◽

2012 ◽

Vol 8 (1) ◽

pp. 37-48

Author(s):

S. Chehaibi ◽

K. Abrougui ◽

F. Haouala

Keyword(s):

Soil Water ◽

Sandy Soil ◽

Water Infiltration ◽

Cone Penetration ◽

Initial State ◽

Soil Water Infiltration ◽

Good Improvement ◽

The Impact ◽

Positive Effect ◽

Resistance To Penetration

The effects of mechanical perforation densities by extracting soil cores through an aerator Vertidrain with a working width of 1.6 m and equipped with hollow tines spaced of 65 mm, were studied on a sandy soil of a grassy sward in the Golf Course El Kantaoui in Sousse (Tunisia). The mechanical aeration was performed at two densities: 250 and 350 holes/m2. The cone penetration resistance and soil water infiltration were measured. These parameters were performed at initial state before aeration (E0) and then on the 10th, 20th and 30th day after aeration. These results showed that perforation density of 350 holes/m2 had a positive effect on the soil by reducing its cone resistance to penetration compared to the initial state (Rp = 14.8 daN/cm2). At 5 cm depth the decrease in resistance to penetration was 34% and 43% on the 10th and 20th day after aeration, respectively. However, on the 30th day after aeration the soil resistance to penetration tended to grow and its value compared to the initial state decreased only by 21 and 26%, respectively, at 5 and 15 cm of depth only by 10% and 9% with 250 holes/m2 density. The soil water infiltration made a good improvement after aeration compared to the initial state. This parameter increased from 4.8 cm/h to 8.3, 10.9 and 13.1 cm/h with 250 holes/m2 density and to 10, 12.9 and 14.8 cm/h with 350 holes/m2 density on the 10th, 20th and 30th day following the aeration.

Download Full-text