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Accueil du site → Doctorat → Inde → 1990- 1999 → CROP-WEATHER RELATIONSHIP IN RABI MAIZE (Zea mays L.) AND TESTING OF CERES MAIZE MODEL FOR THE MIDDLE GUJARAT AGROCLIMATIC ZONE

Anand Agricultural University (1992)

CROP-WEATHER RELATIONSHIP IN RABI MAIZE (Zea mays L.) AND TESTING OF CERES MAIZE MODEL FOR THE MIDDLE GUJARAT AGROCLIMATIC ZONE

Reddy, D. Raji

Titre : CROP-WEATHER RELATIONSHIP IN RABI MAIZE (Zea mays L.) AND TESTING OF CERES MAIZE MODEL FOR THE MIDDLE GUJARAT AGROCLIMATIC ZONE

Auteur : Reddy, D. Raji

Université de soutenance : Anand Agricultural University, Anand

Grade : Ph. D (AGRICULTURAL METEOROLOGY) 1992

Résumé
Maize (Zea mays L.) is one of the most important cereals both for human and animal consumption. Maize is grown in climates ranging from temperate to tropics during the period when mean daily temperatures are above 15 c and frost free. Weather variables affect the crop growth differently in different phenophases during its growth cycle. Field experiments during the rabi seasons of 1989-90 and 1990-91 were conducted with cv Ganga Safed-2 and were laid out in split plot design with three dates of sowing as main plot and four irrigation regimes as sub-plot, replicated six times. The results obtained in the study revealed that, the lower temperatures observed in silk emergence to physiological maturity phase gave higher grain yields. The crop had the maturity periods ranging from 104 to 112 and 121 to 131 days from emergence in 1989-90 and 1990-91, respectively. Higher crop growth rate coupled with lower leaf weight ratio contributed towards higher grain yield. The peak leaf area index beyond certain threshold value did not contribute to higher grain yields. Radiation use studies indicated higher intercepted solar radiation and intercepted photosynthetic active radiation use efficiencies for first date of sowing (October 5) in both the years of study ; the higher values being noticed in 1990-91. The extinction coefficient (K) calculated by using incident solar radiation and transmitted solar radiation showed a value of 0.78. Grain yields were significantly higher in first date of sowing in the year 1990-91. This was because of lengthening in grain filling period due to lower temperatures. Irrigation scheduling technique by infrared thermometry could save 20-25% of irrigation water over farmers’ method. Yield attributes such as test weight, ear weight and ear numbers positively contributed towards grain yields.

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