Medium duration hybrid rice

COMMERCIAL HYBRID rice production has prompted new research in agronomic management.

Exploitation of hybrid vigour is one of the approaches by which productivity of rice could be increased in areas where the yield was already attained the potential level by the use of conventional varieties.

Progress in the development and use of hybrid rice technology in India was delayed for variety of reasons, viz., lack of availability of suitable parent lines, difficulties encountered in seed production techniques and the justified emphasis on tapping fully the yield potential of the then available high yielding varieties.

Growing hybrid rice is a complex process and especially agronomic management of hybrid rice differs considerably from that of inbred rice varieties.

Of the several agronomic practices, optimum plant density and fertiliser management are considered as challenges in hybrid rice cultivation.

An experiment was undertaken at AC & RI, Killikulam with CoRH-2 rice hybrid. The treatments consisted of three plant population 50 hills m-2 (20x10cm), 40 hills m-2 (25x10cm) and 33 hills m-2 (30x10cm) with N management practics viz., 125, 150, 175, 200 Kg N ha -1 as prilled urea with 100, 125, 150, 175, Kg Nha-1 as prilled urea +25 Kg N as green manure Sesbania aculeata) The results revealed that adoption of optimum plant population 40 hills m-2 for CoRH2 rice hybrid did not show any interplant competition and resulted increased uptake, DMP and yield attributes. As a cumulative effect there was greater enhancement of yield at 40 hills m-2 population.

The growth and yield of hybrid rice were improved when inorganic nitrogen was applied in conjunction with green manure. Incorporation of green manure sesbania aculeata at 14 days before transplanting under lowland condition liberated many organic acids and aid in early phosphorus availability for rice crop.

Further green manuring also increased the availability of N and K and also soil organic carbon content.

Higher magnitude of this parameter would have helped in accumulation of more dry matter and there by produce an increased rice grain yield in green manure applied plots.

To get an increased yield by exploiting hybrid vigour in CoRH-2 rice hybrid, adoption of 40 hills m-2 (25x10cm) with 175 kg Nha-1 as prilled urea +25 kg N as green manure was the ideal agronomic management practice as it produced a higher grain yield of 7813 kg ha-1 and higher revenue also.

B. J. Pandian

V.Arumugaperumal & S. Avudaithai

Department of Agronomy

AC & RI. Killikulam

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