GROWTH AND PRODUCTIVITY OF SPECIALITY CORN AS INFLUENCED BY DIFFERENT LEVELS OF NITROGEN UNDER PONGAMIA PLANTATIONS

摘要

A field experiment was conducted during kharif 2011 at the Student's Farm, College of Agriculture, Rajendranagar, Hyderabad on red sandy loam soils to study the effect of nitrogen management in speciality corn under Pongamia + maize agri-silvi system. All the growth and yield attributes such as plant height, dry matter production, leaf area index, cob length, cob girth, number of cobs plant-1, number of rows cob-1, number of kernals cob-1and 100 kernel weight were found maximum at 120 kg N ha-1than at the remaining nitrogen levels. Whereas, cob weight (with husk) was found maximum at 120 kg ha-1 but was on par with 90 kg N ha-1. Similarly cob yield (with husk), green fodder/stover yield, harvest index, kernel yield of popcorn and shelling percentage of popcorn were found significantly higher at 120 kg N ha-1than the other two lower doses of nitrogen. The different types of corn were found significantly different from each other regarding growth parameters such as plant height, days to 50 per cent silking and days to maturity. Regarding the effect on yield attributes and yield, all the three types of corn were found significantly different from each other in cob length, cob girth, cob weight (with husk), green cob yield as well as green fodder/stover yield