Effects of some cultural practices on blast disease and rice yield at an acid upland site

Kurschner E.M., . and Bonman J.M., . and Garrity D.P., . and Tamisin M.M., . and Estrada B.A., . and Quijano C., . and Neue H.U., . (1990) Effects of some cultural practices on blast disease and rice yield at an acid upland site. [Proceedings Paper]

Cultural practices were tested as means to control blast disease in upland rice. We studied the effects of rice hull/hull ash applications no hulls with hulls with high rate of hulls or hullshull ash at two fertility nitrogen/phosphorus N/P levels and the effects of N timing no N and two early two late three equal and five equal splits of 90 kg N/ha on leaf blast panicle blast total dry matter and grain yield. The high N/P rate increased leaf blast by 50 percent and panicle blast by 34 percent. At low N/P leaf blast was decreased by 7.5 percent with hull and by 25 percent with hull/hullash amendments. Panicle blast decreased 16.1 percent with hulls and 28 percent with hulls/hullash at high N/P. Late splits of 90 kg N/ha resulted in a one to twofold increase of leaf blast compared with zero N; other split treatments resulted in four to fivefold higher leaf blast. Panicle blast was increased by N application but no differences among split treatments by 18 percent and grain yield by 8.5 percent. In high N/P plots total dry matter was decreased by amendments and grain yield was unchanged. Total dry matter decreased with early N splits but increased by 10-32 percent with other N split treatments compared with zero N. Grain yield was not significantly affected by split treatments. The cultural practices tested were insufficient to control blast under the high disease severities present. However hull/ash amendments and N timing could improve yields if combined with other measures such as the use of resistant cultivars or fungicide treatment

Full text available from:

Abstract

Cultural practices were tested as means to control blast disease in upland rice. We studied the effects of rice hull/hull ash applications no hulls with hulls with high rate of hulls or hullshull ash at two fertility nitrogen/phosphorus N/P levels and the effects of N timing no N and two early two late three equal and five equal splits of 90 kg N/ha on leaf blast panicle blast total dry matter and grain yield. The high N/P rate increased leaf blast by 50 percent and panicle blast by 34 percent. At low N/P leaf blast was decreased by 7.5 percent with hull and by 25 percent with hull/hullash amendments. Panicle blast decreased 16.1 percent with hulls and 28 percent with hulls/hullash at high N/P. Late splits of 90 kg N/ha resulted in a one to twofold increase of leaf blast compared with zero N; other split treatments resulted in four to fivefold higher leaf blast. Panicle blast was increased by N application but no differences among split treatments by 18 percent and grain yield by 8.5 percent. In high N/P plots total dry matter was decreased by amendments and grain yield was unchanged. Total dry matter decreased with early N splits but increased by 10-32 percent with other N split treatments compared with zero N. Grain yield was not significantly affected by split treatments. The cultural practices tested were insufficient to control blast under the high disease severities present. However hull/ash amendments and N timing could improve yields if combined with other measures such as the use of resistant cultivars or fungicide treatment

[error in script]

Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	ORYZA SATIVA
AGROVOC Term:	CONTROL DE ENFERMEDADES
AGROVOC Term:	TIZON/ METODOS DE CULTIVO
AGROVOC Term:	RENDIMIENTO
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15292

Actions (login required)

View Item