Effect of Duration of Weed Competition on Ratoon Sugarcane (Saccharum Officinarum L.) under Two Levels of Fertilization

Date

10-1985

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Oscar B. Zamora

Abstract

Ratoon sugarcane (Saccharum officinarum L.) tolerated 2 weeks of weed competition without adverse effect on sugar yield and up to 4 weeks without significant reduction in cane yield. Competition beyond 2 weeks reduced sugar yield nu 19 to 93 %. Beyond 4 weeks of competition, cane yield was reduced by 36 to 92%. Satisfactory sugar yield was obtained at 8 weeks of crop-weed competition.

At a given duration of weed competition, the two levels of fertilizer (200-150-3—and 100-75-150) did not effect sugar and cane yield.

Higher cane yield was obtained in plots fertilized with 200-150-300 but showed no effect on sugar yield. The number of millable stalks per hectare was the most affected by duration of weed competition. There was a 19% reduction as early as 6 weeks and as much as 93% when competition was allowed for he entire season. Production of millable stalks was favored under a low level of fertilizer.

Prolonged weed competition resulted to greater production of non-millable stalks with higher level of fertilization. Here was a continuous increase in non-millable stalk production with increased duration of weed competition.

Levels of fertilization did not affect stalk diameter. Duration of weed competition stalk diameter only when competition was allowed for the entire season.

Weed density and biomass are favored under a high level of fertilization for a given duration of weed competition. Duration of weed competition generally reduced the weed density but with increased biomass production.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1985 A42 P38

Document Type

Thesis

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