Experimental study on the influence of soluble salt content on unsaturated mechanical characteristics of undisturbed Ili loess

Author(s):  
Lisi Niu ◽  
Wenyuan Ren ◽  
Aijun Zhang ◽  
Yuguo Wang ◽  
Zhichao Liang ◽  
...  
2020 ◽  
Vol 5 (4(73)) ◽  
pp. 12-18
Author(s):  
G.T. Bekmirzaev ◽  
I.A. Begmatov ◽  
D.B. Yulchiev

The purpose of the experimental study was the selection of salt tolerant crops and the search for useful horticultural species for growing them on saline lands. The experimental study was conducted at the University of Algarve, Portugal, in a greenhouse. The following vegetable crops were selected for research: lettuce (Lactuca sativaL), New Zealand spinach (Tetragonia tetragonioides) and garden purslane (Portulaca oleracea). Experimental results showed that New Zealand spinach and garden purslane have high potential as species resistant to high salt content and are therefore recommended for cultivation in order to reduce soil salinity. The above crops, mainly New Zealandspinach, are good types of garden crops with high useful qualities and productivity. Therefore, it has been shown that this method is a clean and environmentally friendly tool to prevent salinization and maintain the sustainability of agricultural systems


1963 ◽  
Vol 43 (1) ◽  
pp. 65-69
Author(s):  
E. H. Hobbs ◽  
G. C. Russell

Fields of Chin loam soil, one irrigated by sprinkler methods and the other by surface methods, were sampled to a depth of 5 feet. Analysis of the samples showed the soluble salt content of the sprinkled field, at all depths sampled, to be consistently higher than that of the surface-irrigated field. It is suggested that present sprinkler irrigation practices in this area should be modified to provide additional water for leaching purposes.


2013 ◽  
Vol 820 ◽  
pp. 67-70
Author(s):  
Tuo Li ◽  
Hong Bai Bai ◽  
Chun Hong Lu

Knitted-dapped metal rubber was developed to solve problems of metal rubber with low stiffness and test samples with different sizes were manufactured. Static tests and dynamic tests were carried out to study influences of density and thickness on the static stiffness and influences of frequency, amplitude and preload on dynamic characteristics. Results show that static stiffness rises when density or thickness increases. Frequency has little influence on dynamic characteristics. Knitted-dapped metal rubber will have smaller stiffness and better characteristics of damping, if amplitude increases; if preload increases, energy consumed in the vibration will be more.


1960 ◽  
Vol 11 (5) ◽  
pp. 705
Author(s):  
WD Andrew ◽  
FW Hely

The frequency of eight annual species of Medicago was determined on 10 soil groups in a region climatically favourable for medics. They occurred on nine of these, the overall frequency being in the order M. minima (L.) Bart. > M. denticulata Willd. > M. laciniata (L.) Mill., M. praecox DC., M. tribuloides Desr., and M. orbicularis (L.) Bart. > M. arabica (L.) Huds. and M. confinis Koch. M. minima was more tolerant of variation of soil habitat than any other medic in the region. M. denticulata was most commonly found on the soils of high soluble salt content and showed the greatest tolerance of poor drainage conditions. M. laciniata occurred in greatest abundance on soils of the well-drained brown acid group. M. praecox was most commonly found on soils with a compact gravelly surface. M. tribuloides was recorded on five soil groups but was common only on the black earths. M. orbicularis was confined to the black earth and red loam soils. M. arabica was rarely found, being restricted to lower, fertile, well-drained parts of the landscape, and M. confinis occurred only occasionally and then in association with M. denticulata.


2015 ◽  
Vol 25 (2) ◽  
pp. 1-5
Author(s):  
Stefania Farinon ◽  
Pasquale Fabbricatore ◽  
Riccardo Musenich ◽  
Giovanni Bellomo ◽  
Massimo Sorbi ◽  
...  

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