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YIELD RESPONSE FACTOR (KY) FOR WINTER CORN CROP IN THE REGION OF DOURADOS, MS, BRAZIL
- Source :
- Engenharia Agrícola, Vol 39, Iss 5, Pp 573-578 (2019), Engenharia Agrícola, Volume: 39, Issue: 5, Pages: 573-578, Published: 04 NOV 2019, Engenharia Agrícola v.39 n.5 2019, Engenharia Agrícola, Associação Brasileira de Engenharia Agrícola (SBEA), instacron:SBEA, Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice), Empresa Brasileira de Pesquisa Agropecuária (Embrapa), instacron:EMBRAPA
- Publication Year :
- 2019
- Publisher :
- Sociedade Brasileira de Engenharia Agrícola, 2019.
-
Abstract
- Plant yield is strongly influenced by the amount of water used by it. In this sense, yield response factor (Ky) allows evaluating the decrease in yield as a function of the evapotranspiration that occurs, which may be an important tool for harvest forecasting. Therefore, this study aimed to determine Ky for winter corn crop grown in the region of Dourados, MS, Brazil. The yield function analysis based on the water factor, which requires actual (Ya) and maximum (Ym) yield data, as well as actual (ETa) and maximum (ETm) evapotranspiration, was used to adjust Ky. Ym was assumed to be 8,820 kg ha−1, while Ya was obtained for each season from the database SIDRA from IBGE. ETm and ETa were estimated by sequential daily water balance, considering four different sowing dates (all in the off-season). In total, seasons from 2001 to 2013 were analyzed. The high Ky value obtained (1.22) for winter corn crop showed its high sensitivity to water deficit. Its yield is strongly influenced by water availability so that for every 1% reduction in evapotranspiration, there is a 1.22% yield reduction.
- Subjects :
- Irrigation
Agriculture (General)
evapotranspiration
Evapotranspiração
Zea mays
irrigation
S1-972
Crop
Water balance
Milho
Evapotranspiration
Yield (wine)
Balanço Hídrico
water deficit
Response factor
Corn
Milho safrinha
Crop yield
Sowing
04 agricultural and veterinary sciences
Agricultural and Biological Sciences (miscellaneous)
Agronomy
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Environmental science
Subjects
Details
- Language :
- English
- ISSN :
- 01006916
- Volume :
- 39
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Engenharia Agrícola
- Accession number :
- edsair.doi.dedup.....05f27d5b6c7b69dafcd54622132b413d