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Table 58. Pod numbers produced per 25 plants, yield, and percentage of insect-caused yield loss on<br />
intercropped pigeonpea (cv HY-2 and HY-3A) on Alfisol and Vertisol, ICRISAT Center,<br />
1976-1977.<br />
HY-2 a<br />
HY-3A<br />
Treatment Alfisol Vertisol Alfisol Vertisol<br />
PP/S b<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
930.2<br />
320.2<br />
19.7<br />
710.8<br />
169.6<br />
35.1<br />
582.7<br />
175.7<br />
43.9<br />
525.8<br />
84.4<br />
43.0<br />
PP/S c<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
790.7<br />
336.5<br />
23.2<br />
426.6<br />
120.3<br />
39.6<br />
707.2<br />
279.2<br />
41.3<br />
455.0<br />
69.9<br />
51.1<br />
PP/PM<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
1 045.0<br />
302.2<br />
18.0<br />
765.6<br />
219.3<br />
23.9<br />
837.5<br />
375.0<br />
38.9<br />
424.4<br />
94.6<br />
54.6<br />
PP/St<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
1 175.5<br />
405.7<br />
24.1<br />
841.2<br />
229.5<br />
27.3<br />
888.0<br />
426.7<br />
35.6<br />
651.6<br />
200.0<br />
49.0<br />
PP<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
1101.7<br />
317.2<br />
20.7<br />
1257.8<br />
489.5<br />
22.6<br />
1 277.0<br />
634.5<br />
31.0<br />
677.2<br />
193.8<br />
55.0<br />
L.S.D. (0.()5)<br />
Pods (no/25 plants)<br />
Yield (kg/ha)<br />
Yield loss (%)<br />
NS<br />
NS<br />
3.8<br />
NS<br />
NS<br />
9.0<br />
227.1<br />
169.2<br />
NS<br />
86.1<br />
NS<br />
NS<br />
a Inclusive of two pickings.<br />
b PP = Pigeonpea, S = Sorghum, PM = Pearl Millet, St = Setaria.<br />
c Sown mixed within rows.<br />
A g r o n o m y and W e e d Science<br />
To capitalize on an improved soil- and waterresource<br />
base, it is essential to develop cropping<br />
systems which will provide a continuum of<br />
productive crop growth from the onset of the<br />
rainy season as far as possible into the postrainy<br />
season. Because of the great potential for increased<br />
production by intercropping and other<br />
double-cropping systems, additional emphasis<br />
has been placed upon basic studies (reported in a<br />
separate section under the Cropping Systems<br />
subprogram) in this field. Agronomic research<br />
reported here involved preliminary studies on<br />
row direction and lodging, weed-management<br />
research, and a continuation of the "Steps in<br />
Improved Technology" experiments.<br />
In the SAT, many weed-control problems<br />
remain unsolved due to limited weed research on<br />
crops and cropping systems. At ICRISAT Center,<br />
the major approach to weed management is<br />
through habitat management, and research efforts<br />
are being oriented to obtain more basic<br />
information on the crop-weed balance. Weed<br />
research on individual crops was designed<br />
mainly to determine the competitiveness with<br />
weeds of distinctly different cultivars of the<br />
major crops and to study the tolerance of these<br />
cultivars to some selected herbicides.<br />
167
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