Evaluation of Biofertilizers in Irrigated Rice: Effects on Grain Yield at Different Fertilizer Rates

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Banayo, Nino Paul Meynard; Sta. Cruz, Pompe; Aguilar, Edna; Badayos, Rodrigo; Haefele, Stephan, 2014, "Evaluation of Biofertilizers in Irrigated Rice: Effects on Grain Yield at Different Fertilizer Rates", https://doi.org/10.7910/DVN/23662, Harvard Dataverse, V1

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Description	Biofertilizers are becoming increasingly popular in many countries and for many crops, but very few studies on their effect on grain yield have been conducted in rice. Therefore, we evaluated three different biofertilizers (based on Azospirillum, Trichoderma, or unidentified rhizobacteria) in the Philippines during four cropping seasons between 2009 and 2011, using four different fertilizer rates (100% of the recommended rate [RR], 50% RR, 25% RR, and no fertilizer as Control). The experiments were conducted under fully irrigated conditions in a typical lowland rice environment. Significant yield increases due to biofertilizer use were observed in all experimental seasons with the exception of the 2008/09 DS. However, the effect on rice grain yield varied between biofertilizers, seasons, and fertilizer treatments. In relative terms, the seasonal yield increase across fertilizer treatments was between 5% and 18% for the best biofertilizer (Azospirillum-based), but went up to 24% in individual treatments. Absolute grain yield increases due to biofertilizer were usually below 0.5 t/ha, corresponding to an estimated additional N uptake of less than 7.5 kg N/ha. The biofertilizer effect on y ield did not significantly interact with the inorganic fertilizer rate used but the best effects on grain yield were achieved at low to medium fertilizer rates. Nevertheless, positive effects of the biofertilizers even occurred at grain yields up to 5 t/ha. However, the trends in our results seem to indicate that biofertilizers might be most helpful in rainfed environments with limited inorganic fertilizer input. However, for use in these target environments, biofertilizers need to be evaluated under conditions with abiotic stresses typical of such systems such as drought, soil acidity, or low soil fertility.
Keyword	Azospirillum, biofertilizer, grain yield, inorganic fertilizer, PGPR, plant growth-promoting rhizobacteria, rice, Trichoderma
Notes	Subject: null Type: CESD Notes: ;
License/Data Use Agreement	CC0 1.0

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Citation Metadata

Persistent Identifier	doi:10.7910/DVN/23662
Publication Date	2014-01-19
Title	Evaluation of Biofertilizers in Irrigated Rice: Effects on Grain Yield at Different Fertilizer Rates
Author	Banayo, Nino Paul MeynardIRRI-CESD Sta. Cruz, PompeAgricultural Systems Cluster, College of Agriculture (CA), University of the Philippines at Los Banos (UPLB) Aguilar, EdnaAgricultural Systems Cluster, College of Agriculture (CA), University of the Philippines at Los Banos (UPLB) Badayos, RodrigoAgricultural Systems Cluster, College of Agriculture (CA), University of the Philippines at Los Banos (UPLB) Haefele, StephanIRRI-CESD
Point of Contact	Use email button above to contact. Nino Paul Meynard Banayo (IRRI-CESD)
Description	Biofertilizers are becoming increasingly popular in many countries and for many crops, but very few studies on their effect on grain yield have been conducted in rice. Therefore, we evaluated three different biofertilizers (based on Azospirillum, Trichoderma, or unidentified rhizobacteria) in the Philippines during four cropping seasons between 2009 and 2011, using four different fertilizer rates (100% of the recommended rate [RR], 50% RR, 25% RR, and no fertilizer as Control). The experiments were conducted under fully irrigated conditions in a typical lowland rice environment. Significant yield increases due to biofertilizer use were observed in all experimental seasons with the exception of the 2008/09 DS. However, the effect on rice grain yield varied between biofertilizers, seasons, and fertilizer treatments. In relative terms, the seasonal yield increase across fertilizer treatments was between 5% and 18% for the best biofertilizer (Azospirillum-based), but went up to 24% in individual treatments. Absolute grain yield increases due to biofertilizer were usually below 0.5 t/ha, corresponding to an estimated additional N uptake of less than 7.5 kg N/ha. The biofertilizer effect on y ield did not significantly interact with the inorganic fertilizer rate used but the best effects on grain yield were achieved at low to medium fertilizer rates. Nevertheless, positive effects of the biofertilizers even occurred at grain yields up to 5 t/ha. However, the trends in our results seem to indicate that biofertilizers might be most helpful in rainfed environments with limited inorganic fertilizer input. However, for use in these target environments, biofertilizers need to be evaluated under conditions with abiotic stresses typical of such systems such as drought, soil acidity, or low soil fertility.
Keyword	Azospirillum biofertilizer grain yield inorganic fertilizer PGPR plant growth-promoting rhizobacteria rice Trichoderma
Notes	Subject: null Type: CESD Notes: ;
Production Date	2009
Distributor	Agriculture http://www.mdpi.com/journal/agriculture
Distribution Date	2012-03-14
Depositor	Jean Sabado
Deposit Date	2013-12-03
Date of Collection	Start Date: 2008; End Date: 2011
Related Dataset	Witt, C.; Buresh, R.J.; Peng, S.; Balasubramanian, V.; Dobermann A. Nutrient management. In Rice: A Practical Guide to Nutrient Management; Fairhurst, T.H., Witt, C., Buresh, R.J., Dobermann, A., Eds.; International Rice Research Institute, International Plant Nutrition Institute, and the International Potash Institute: Singapore, 2007; pp.1-45.

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Geographic Coverage	Philippines
Geographic Unit	CES-UPLB; experimental sitel ES-IRRI
Geographic Bounding Box	121.15 14.11

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