Cotton Yield and Fiber Quality Response to Green Manures and Nitrogen

Autor: Bauer, P. J., Camberato, J. J., Roach, S. H.
Zdroj: Agronomy Journal; September 1993, Vol. 85 Issue: 5 p1019-1023, 5p
Abstrakt: The quantity and availability of N from green manures will considerably affect the N management of a succeeding cotton (Gossypium hirsutumL.) crop. This study was conducted to determine the N supplying capacity of crimson clover (Trifolium incarnatumL.), Austrian winter pea [Pisum sativumsubsp. arvense(L.) Poir.], and rye (Secale cerealeL.) to cotton and their influence on cotton yield and fiber properties. Green manure treatments (and a fallow check) with fertilizer N levels of 0, 56, 112, and 168 kg ha−1were compared for 3 yr on a Norfolk loamy sand (fine‐loamy, siliceous, thermic Typic Kandiudult). Soil moisture at planting was similar among the four green manuretr eatments. At the 0 N level, the legumes generally had higher soil NO3‐N than rye or fallow. Cotton grown following clover and pea with 0 kg ha−1added N had petiole NO3‐N levels similar to those of rye and fallow with 56 kg N ha−1. Fertilizer N had no influence on cotton yield in the pea winter cover treatment. A quadratic regression equation best described the lint yield response following clover. For both rye and fallow treatments, yield plateaued at 56 kg N ha−1. Green manures had little influence on fiber properties. The results indicate that legumes supply adequate but not excessive N for modern cotton production and that incorporation of rye into the production system does not affect N fertilization requirements.
Databáze: Supplemental Index