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Nitrogen Fertilization of Wheat Double‐Cropped Following Grain Sorghum in a No‐Tillage System
Author(s) -
Howard Donald D.,
Lessman Gary
Publication year - 1991
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1991.00021962008300010049x
Subject(s) - sorghum , loam , agronomy , sowing , tillage , randomized block design , cover crop , mathematics , crop , multiple cropping , nitrogen , cropping system , field experiment , soil water , biology , chemistry , ecology , organic chemistry
Utilization of wheat ( Triticum aestivum L. em Thell.) as a cash crop or cover crop in a double‐cropping system is desirable to prevent excessive soil erosion on loess‐derived soils in the southern USA. Fall and spring N application to winter wheat double‐cropped following grain sorghum ( Sorghum bicolor L.) was evaluated on a Grenada silt loam (fine‐silty, mixed, thermic Glossic Fragiudalf). The experimental design was a randomized complete block with a split‐plot arrangement of treatments. Rates of N applied at planting; (0, 34, and 67 kg ha −1 ) were the main plots, with N rates applied in the spring (0, 34, 67, 101 and 134 kg ha −1) the sub‐plots. Fall N (N f ) increased both yield and plant height. Spring N (N s ) had a. greater effect on yield and plant height than N f . Yields increased from 0.83 to 2.61 Mg ha −1) by increasing N s from 0 to 134 kg ha −1) without N s . Yields increased from 1.50 to 2.67 Mg ha −1) by increasing N a from 0 to 67 kg ha −1 with 67 kg ha −1> / N f . Yield variation was expressed by Y = 0.822 + 0.0098 N f + 0.0248 N s − 8.5 × 10 −5) N 2 s + 1.45 × 10 −5 N f N s − 7.41 × 10 −7 N f N 2 s . Plant height increased from 56 to 85 cm by increasing N s from 0 to 134 kg ha −1 without N f , but increased from 67 to 80 cm by increasing N s from 0 to 67 kg ha −1 with 67 kg ha −1 N f One‐hundred‐kernel weight decreased from 2.35 to 2.11 g by increasing N s from 34 to 134 kg ha ‐1 . Grain N increased from 19.9 to 23.2 g kg ‐1 by increasing N s from 34 to 134 kg ha −1 .