Abstract
The relation between grain yield and yield components can be expressed as Grain yield (g m -2 ) = No. panicles m -2 × no. spikelets panicle -1 × % fertile spikelets panicle -1 × weight of single spikelet (g) (De Datta 1981, Arraudeau and Vergara 1988). This formula does not hold well for rainfed upland rice when the paired t test is applied. Therefore I attempted various multiplication factors and finally ended up with 0.5, as described in this note. A complete block design with three replications was used during the wet seasons (WS) of 1992 and 1993, with 26 and 21 entries, respectively. They were direct-seeded (10 g m -2 in eight plots, 4 m in length, with 25-cm row spacing. The soil was low in available N and P 2 O 5 and medium in available K 2 O (220.0, 9.6, and 220.0 kg ha -1 ) at pH 5.6. A dose of 40-8.8-8.3 kg NPK ha -1 was applied. Five plants were randomly selected from each plot to record observations on a randomly selected 1-m 2 area (Tables 1 and 2). Grain yield was estimated by substituting the yield attributes in the conventional and a modified formula for all the genotypes. Paired t tests for observed grain yield were similarly calculated for both the years of study.
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