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The University of the Philippines (UP) is the country’s national university. This premier institution of higher learning was established in 1908 and is now a university system composed of eight constituent universities and one autonomous college spread throughout 17 campuses in the archipelago.

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Journal Article

Journal Article

Farmers' estimates of percent whiteheads (WH)  [1993]

Lazaro, A.A.; Rubia, E.G.; Almazan, L.P.; Heong, K.L. (International Rice Research Inst., Los Banos, Laguna (Philippines));

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A study was conducted to compare farmers' estimates with actual counts of WH [whiteheads] caused by stemborers (SB) in 24 ricefields in Munoz, Nueva Ecija, Philippines in Nov 1992. Farmers equated percent WH to percent yield reduction. They all expected about the same reduction in yield as the WH estimate they had given. An estimate of 30% WH meant the farmer was expecting a yield loss of 30% compared with a season without SB damage. Farmers' estimates compared with actual yield reductions were nonsignificant using t-test. On the other hand, computed percent WH differed significantly from actual reductions in yield. This means that farmers made good estimates of their expected yield losses due to SB. Actual percent damage, however, did not coincide with percent yield reduction, which disproved their statement that percent WH equals percent yield reduction. About 70% of the farmers obtained yield losses greater than actual SB damage. The estimates they gave, however, were fairly close to percent yield loss they obtained. This means that factors other than WH caused greater yield reduction. Farmers attributed these differences to factors such as poor soil, lack of fertilizer, late planting, and unfavorable weather
From the journal
International Rice Research Notes (Philippines)
ISSN : 0115-0944

Bibliographic information

Language:
English
Type:
Summary
In AGRIS since:
1994
Volume:
18
Issue:
4
Start Page:
31
All titles:
"Farmers' estimates of percent whiteheads (WH)"@eng
Other:
"Summary (En)"
"1 graph"
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Bibliographic information

Language:
English
Type:
Summary
In AGRIS since:
1994
Volume:
18
Issue:
4
Start Page:
31
All titles:
"Farmers' estimates of percent whiteheads (WH)"@eng
Other:
"Summary (En)"
"1 graph"