Cropping systems for sloping land infected with bacterial wilt
1988
Fernandez, B.B. | Vander Zaag, P. | Tumapon, A.S. | Duna, L.V. | Maape, E.S. | Balanay, N.M. (International Potato Center, c/o International Rice Research Inst., Los Banos, Laguna (Philippines))
Bacterial wilt (BW) caused by Pseudomonas solanacearum is one of the major diseases of potato. Farmers manage this by abandoning their land after two to four croppings and opening a new forested area. Potato farmers plant potato parallel to slopes without making any contour or terracing. Research was done on hilly and BW infested land to evaluate the effect of different cropping systems. Preliminary results for three croppings at three locations indicated that terracing and contouring have almost the same effect on BW incidence and pathogen build-up in the soil. The steepness of the slope and terrace width had no significant effect on the BW incidence and pathogen build-up in the soil. Monoculture potato increased the pathogen population in the soil as well as the BW at all three locations. Corn was the most effective in reducing BW population in the soil. Soil N, P, K content and pH increased with cropping season depending on the cropping pattern. Large differences in potato yield was noted among the three locations. Intavas had higher yield compared with Lantapan and Alas-as, the second cropping of potato gave no yield. Results of field days at Lantapan and Intavas showed the enthusiasm of the farmers for the project. At Intavas, one farmer have started already to innovate by making a semi-terrace and one farmer did contouring. In Lantapan, on the other hand, after the field day and seminar, seven farmers volunteered and suggested that they will do it by "bayanihan system" with technical assistance.
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