Ts. Yadvindersingh,bijaysingh,"khera et Op. Meelu, INTEGRATED MANAGEMENT OF GREEN MANURE, FARMYARD MANURE, AND NITROGEN-FERTILIZER IN A RICE-WHEAT ROTATION IN NORTHWESTERN INDIA, Arid soil research and rehabilitation, 8(2), 1994, pp. 199-205
Sesbania (Sesbania aculeata) is an important green manure crop for wet
land rice, and it can fix large amounts of N2. Farmyard manure (FYM) i
s traditionally a valuable source of nutrients, but it can meet only a
part of the N requirement of the rice crop. Limited information is av
ailable on the nitrogen fertilizer value of green manure and complimen
tary and synergistic effects of green manure, FYM, and nitrogen fertil
izer. A field experiment was conducted during 1989-1993 to evaluate th
e effectiveness of sesbania green manure and FYM (77-105 kg N ha-1) ap
plied either alone or in combination with green manure for wetland ric
e. Sesbania accumulated 90 to 135 kg N ha-1 in 52 days. During each ye
ar, the total N addition to green manure and FYM amended plots was adj
usted to 150 kg N ha-1 by applying additional N th rough urea. The gra
in yield of rice increased significantly up to 150 kg N ha-1. Green ma
nure-N proved as efficient as urea-N in increasing rice yield. The ava
ilability of N from FYM was much lower than from urea or green manure.
The combined application of FYM and green manure could meet all the N
requirements (150 kg fertilizer N ha-1) of the high-yielding rice and
improved the yield potential observed with urea alone. Physiological
efficiency (kg grain kg-1 N uptake) was higher with green manure plus
FYM treatment than urea or green manure alone. Incorporation of FYM al
one or in combination with green manure increased organic carbon and a
vailable P and K contents in soil and significantly improved the yield
of the succeeding crop of wheat.