Influence of planting geometry on photosynthetically active radiation interception and dry matter production relationships in pearl millet

Biomass Pub Date : 1990-01-01 DOI:10.1016/0144-4565(90)90077-W

S.D. Jarwal , Phool Singh , S.M. Virmani

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引用次数: 6

Abstract

A field experiment was conducted at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Center, Patancheru, India to study photosynthetically active radiation (PAR) interception and dry matter production relationships in pearl millet (Pennisetum americanum (L.) Leeke). Two pearl millet genotypes, BJ 104 (G₁) and ICH 226 (G₂) were sown at three planting geometries obtained by using combinations of row and plant spacings (S₁: 37·5 cm × 26·6 cm; S₂: 75·0 cm × 13·3 cm; S₃: 150·0 cm × 6·6 cm) such that plant population was constant at 100 000 ha⁻¹ in all treatments. Cumulative intercepted PAR was maximum (330 MJ m⁻²) in G₂S₂ and minimum (268 MJ m⁻²) in G₁S₃. Conversion efficiency values ranged from 1·87 g MJ⁻¹ in G₁S₂ to 2·32 g MJ⁻¹ in G₂S₃. Final above-ground dry matter followed the pattern of cumulative intercepted PAR and maximum dry matter (7·22 Mg ha⁻¹) was produced by G₂S₂ while G₁S₃ produced minimum dry matter (4·97 Mg ha⁻¹).

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种植形态对珍珠粟光合有效辐射拦截和干物质生产关系的影响

在印度帕坦切鲁国际半干旱热带作物研究所(ICRISAT)中心进行了一项田间试验，研究珍珠粟(Pennisetum americanum (L.))的光合有效辐射(PAR)拦截与干物质生产关系。Leeke)。两个珍珠粟基因型bj104 (G1)和ICH 226 (G2)以行距和株距组合获得的3种种植几何形状(S1: 37.5 cm × 26.6 cm;S2: 75.0 cm × 13.3 cm;S3: 150·0 cm × 6·6 cm)，在所有处理下，植物种群恒定在10万ha−1。累积截获PAR在G2S2中最大(330 MJ m−2)，在G1S3中最小(268 MJ m−2)。G1S2的转换效率值为1.87 g MJ−1,G2S3的转换效率值为2.32 g MJ−1。最终地上部干物质符合PAR累积截获规律，G2S2产生的干物质最多(7·22 Mg ha−1)，而G1S3产生的干物质最少(4·97 Mg ha−1)。

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