Can nutrient‐utilization efficiency be improved by reduced fertilizer supply to maize plants treated with the plant growth regulator paclobutrazol?

نویسندگان

چکیده

In previous investigations of several maize cultivars, an improvement the harvest index was obtained by paclobutrazol (PAC) application combined with increase in water-use efficiency. However, so far nutrient-utilization efficiencies could not be enhanced when control and PAC-treated plants received same amount fertilizers. With adjusted fertilizer supply according to lower requirement smaller, plants, may expected. Thus, present study, PAC applied at growth stage V5 two cultivars (Zea mays L. cvs. Galactus Fabregas) grown a container experiment. Shortly after application, differential NPK fertilization introduced order obtain nutrient (100% NPK), (85% NPK) further slight decrease (78% NPK). Plant height transpiration rates were significantly reduced due treatment stronger effects on than Fabregas. Pollen shed, silking anthesis-silking interval (ASI) unaffected supply. Senescence delayed, whereas it accelerated The grain yield cultivar decreased 13% 20%, this effect strengthened reduction These reductions solely caused decreases kernel number, which closely linked cob length. On contrary, did affect Fabregas less small. Harvest efficiency treatment. contents similar for but strongly related significant application. N-, P- K-utilization both either or treatments. key constraint improvements is PAC. This problem should addressed studies avoidance delayed time fine-tuning cultivar-specific rates.

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ژورنال

عنوان ژورنال: Journal of Agronomy and Crop Science

سال: 2021

ISSN: ['1439-037X', '0931-2250']

DOI: https://doi.org/10.1111/jac.12521