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I-70% yehlabathi ivalwe mamanzi. I-97% yawo woke amani asephasini mamanzi anetswayi. Mamanzi angaphasi kwe-30% kwaphela afretjhi.
Ku-3% yamanzi afretjhi, yi-0.3% mamanzi atholakala ngaphezulu ehlabathini atholakala lula kithi ukobana sewasele nanyana iwasebenzise ekukhiqizeni ukudla kanye nezinye izinto esizikhiqiza ukobana siphile. Amanengi a:
I-69% - iba lirhwaba
0.7% - asemoyeni
30% - angaphasi kwamanzi
Amanzi sisetjenziswa esingapheliko. Inani lamanzi egade lisephasini eminyakeni emakhulukhulu eyadlulako lisesekhona nanje begodu ngeze langezeleleka. Into ekufanele itjhuguluke kwanje yindlela esisebenzisa ngayo isesetjenziswa esili gugwesi ukobana siphile. Sitlhoga kobana singoni amanzi. Emanzini afretjhi esiwasebenzisako:
70% isetjenziselwa zelimo
20% isetjenziswa emabubulweni
10% emizini amanye aselwa babantu.
Ukukhiqiza ukudla kufanele sihlale sitlame iindlela ezitja zokungasebenzisi amanzi khulu begodu singawoni lokhan nasikhiqiza ukudla.
Ukukhiqiza ikhilogramu yinye yenyama yekomo kuthatha i-15 000 yamalitha nanyana i-15 m³ yamanzi
Ukukhiqiza ikhilogramu yerayisi kuthatha i-3 500 yamalitha nanyana i-3.5 m³ yamanzi.
Sinetjhudu ngombana kwezelimo zamvanje, ukuzitlamela izinto sele kusilethele ilwazi elaneleko lokuhlola amanzi asehlabathini. Lokhu kusivumela bona sithelele ngamasistimu amatjha angoni amanzi afana ne-surface kanye ne-underground drip irrigation. Kodwana amanzi angaphezu kwe-60% asetjenziselwa ukuthelelela kwezelimo onakala ngokungasetjenziswa kuhle. Ngokumeda amanzi kuhle, amanzi akhona emirajini yentjalo ezihlukahlukeneko, angarhelebha ukuqeda ukona iintwezo.