Cropping system for sloping land infected with bacterial wilt. Working paper no. 89-15.
1989
Tatoy B.F. | Vander Zaag P. | Tumapon A.S. | Duna L.V. | Maape E.T. | Balanay N.M.
Bacterial wilt (BW) caused by Pseudomonas solanacearum is the major disease of potato in mid-elevation of Bukidnon [Philippines]. Farmers manage this by abandoning their land after 2-4 croppings and opening new forested areas. Potato farmers prefer to plant potatoes parallel to slopes without making any contour or terraces. Research was done on hilly and BW infested land to evaluate the effect of different cropping systems in view of developing long term sustainable cropping systems. Results for 6 cropping seasons at 2 locations indicated that terracing and contouring have almost the same effect on BW incidence and pathogen population in the soil. The steepness of the slope and width of terrace or contour had no effect on BW incidence and pathogen build-up in the soil. Monoculture potato increased the population of the pathogen as well as BW incidence at both locations. The modification of this cropping pattern by sweet potato reduced BW population in the soil. All the crops besides potatoes used in the cropping pattern reduced BW population in the soil as well as BW incidence. Corn was the most effective in reducing BW in the soil. The N, P, K content of the soil and pH increased with cropping season depending on the cropping pattern. Intavas had higher yield compared with Cawayan due to lower BW population in the soil and less BW incidence. Farmers preferred terracing over contouring at both locations but are financially constrained.
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