An aerial drone photo taken on March 27, 2026 shows a center-pivot irrigation equipment on a circular field in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)

An aerial drone photo taken on March 27, 2026 shows circular fields in the suburb of Johannesburg, South Africa. (Xinhua/Chen Wei)