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Effect of Row Direction and Artificial<br />
Lodging Upon Pigeonpea Yields<br />
A preliminary trial was established to study the<br />
effect of row direction (north-south vs. east-west)<br />
of two cereals and pigeonpea alone and in<br />
intercropping systems.<br />
Pigeonpea yields in the north-south direction<br />
were significantly higher than those in the eastwest<br />
direction on both Alfisols and Vertisols.<br />
Table 59. Parasitism levels on Hetiothis armigera (Hubner) from sorghum (CSH-5) and pigeonpea<br />
(ICP-1) grown in various crop proportions in deep Vertisol, ICRISAT Center, 1976-1977.<br />
P a r a s i t i s m<br />
Sorghum<br />
Pigeonpea<br />
Plant population<br />
(Pigeonpea/Sorghum) Mid-Sep Late Nov Mid-Dec Early Jan a Early Feb<br />
(1000/ha)<br />
Week a 4 8 12 16 20 24 28 32<br />
(%)<br />
32.0:85.5<br />
15.0:128.5<br />
11.5:145.0<br />
8.0:150.0<br />
L.S.D. (0.05)<br />
40.5<br />
37.9<br />
31.5<br />
26.9<br />
NS<br />
9.5<br />
9.5<br />
8.0<br />
15.0<br />
NS<br />
32.0<br />
37.0<br />
39.0<br />
53.0<br />
NS<br />
a Peak activity of parasites observed.<br />
4 8<br />
1 9 7 4 - 1 9 7 5<br />
1 9 7 5 - 1 9 7 6<br />
40<br />
1 9 7 6 - 1 9 7 7<br />
32<br />
2 4<br />
16<br />
8<br />
0<br />
a B e g i n n i n g 1 J u l .<br />
34.5<br />
50.5<br />
51.0<br />
59.0<br />
7.3<br />
39.4<br />
34.4<br />
17.9<br />
30.2<br />
NS<br />
36 40 44<br />
52<br />
J u l A u g S e p O c t N o v D e c J a n F e b M a r A p r M a y J u n<br />
Figure 76. Catch of Heliothis armigera (Hubner) from August 1974 through May 1977 in Trap No. 1 (at<br />
Crap Improvement Building), ICRISAT Center. Plotted as 4-week moving means.<br />
168
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