Fig. 4
Wet rice field showing microzones of patches of poor plant growth (yellowish rice plant colour), soil colour difference (reddish and black soil colour), water level differences (areas with and without water) and field level differences (higher and lower areas). The rice field in the picture was levelled using a bulldozer, often seen as a problem due to the red infertile soil beneath the fertile black topsoil being uncovered (Photo: A. Hollaus)