Dear Dr. Sayar, thank you for your question. Unfortunately, I have not studied specifically on the subject until now, however, I have a little experience on the irrigation and drainage systems.

Dear Dr. Toprak, thank you for your interest and your good intentions.  With best regards...

Mostly for rangeland rehabilitation and restoration you are need full package of interventions such as:

- promising site selection with annual rainfall 100 - 200 mm, Gentle slope 2 - 10%, soil depth > 50 cm ...

- rangeland protection

- using of water harvesting techniques.

- fodder shrubs planting.

- native plant direct seeding and

- management.

In our region rangelands annual average reainfall amount is almost 400 mm. and rockness and drought in summer months are major problems in the rangelands. Addditionally, in our country almost no native cultivar can be used in overseeding of rangelands. 

Mehmet Salih Sayar

In areas with 400 mm you can cultivate field crops. In your country you are consider it as a rangeland area but in my country it is considered a humid area for rainfed wheat, legume, vegetables and fruit trees planting. So you can establish a very good job in your area.

all the best, Yahya

Dear Salih Sayar

Thank you for your Interesting question.

The challenge of water scarcity is dry areas, Therefore, the use of rainwater catchment systems with water-resistant strains most effective way to restore these areas.

Also taking advantage of the new systems and drip irrigation can be beneficial in limited areas. So I completely agree with the way Yahya Al-Satari.

good luck

Most appropriate methods to improve dryland rangeland..

Poverty, food insecurity, natural resource degradation and climate change are global

challenges; but they impact most severely on rural communities in dry areas.

The dry areas of the developing world presently occupy over 40% of the

earth’s land surface and are home to approximately 2.5 billion people.

These regions struggle to provide sufficient food for their growing

populations and face a series of daunting physical and demographic

challenges: high poverty levels and unemployment, rapid urbanization,

severe water scarcity, and land degradation. Unfortunately, many of these

problems and constraints are expected to worsen as a result of climate

change. “Making the desert bloom” has never been a harder challenge.

Drylands will increase.

In this millennium, global drylands face a myriad of problems that present

tough research, management, and policy challenges. Recent advances in

dryland development, however, together with the integrative approaches

of global change and sustainability science, suggest that concerns about

land degradation, poverty, safeguarding biodiversity, and protecting the

culture of up to 2.5 billion people can be confronted with renewed

optimism (Reynolds, et al. 2007)

Systems solutions

Potential solutions will include crop and livestock genetic improvement,

better water productivity, and more sustainable farming techniques such as

conservation agriculture. ‘Climate smart’ strategies and technologies also

have an important role to play, helping to increase food production, while

safeguarding precious natural resources.

You might consider implementing connectivity modifiers (https://www.sciencedirect.com/science/article/abs/pii/S1875963715000312) which trap sediment and litter in order to make more suitable habitats for seedling re-establishment. Once an appropriate method is determined for reestablishing native plants, other tools to manage the plants (eg. fire and livestock) can be implemented in order to maintain or improve the plant community.

https://www.iucn.org/theme/ecosystem-management/our-work/global-drylands-initiative/iucn-and-unccd/advancing-global-action-rangeland-restoration