🌽Maize -- Queen of Cereals (Complete Cultivation Guide)

In Bihar’s river plains, farmers harvest Rabi maize under cool winter skies and achieve yields that rival those of temperate countries. In Karnataka’s rainfed uplands, Kharif maize sustains both poultry feed mills and rural kitchens. Maize is India’s third most important food crop and holds the title “Queen of Cereals” because it has the highest genetic yield potential among all cereals.

In the previous lesson, we covered Barley — a self-pollinated Rabi cereal. Maize is fundamentally different: it is cross-pollinated (due to protandry), a C4 plant (not C3), and day neutral (not long-day). These distinctions make maize a favourite comparison target in exams.

This chapter covers:

1. Basics and QPM — botany, protein quality, and the Opaque-2 gene
2. Climate and soil — temperature, waterlogging sensitivity
3. Botany — protandry, tassel, silk, and Sturtevant’s species classification
4. Varieties — hybrids, composites, sweet corn, baby corn, fodder, and popcorn
5. Nutrient management and yield — NPK doses, critical stages

All sections are high-yield for IBPS AFO, NABARD, and RRB SO exams.

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Basics

• Maize is known as the Queen of Cereals / Backbone of America because it has the highest genetic yield potential among all cereals.
• Maize is a cross-pollinated crop. Cross-pollination occurs because male (tassel) and female (silk) flowers mature at different times — a phenomenon called protandry.
• Maize contains 65-70% starch, 8-10% protein (Zein), and 4-5% oil. Zein is deficient in lysine and tryptophan.

Quality Protein Maize (QPM)

QPM is an improved variety containing higher amounts of tryptophan and lysine with lower leucine and isoleucine in the endosperm, developed using Opaque-2 genes. QPM addresses the nutritional deficiency of normal maize, making it a better source of essential amino acids.

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Climate

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Soil

• Best adapted to well-drained sandy loam to silty loam soils.
• pH range: 5.5-7.5.
• Very sensitive to waterlogging — cannot tolerate standing water beyond 4-5 hours.

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Botany

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Maize Species (Sturtevant, 1899)

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Varieties by Type

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Seed Rate and Root System

Root System

Maize has a fibrous, deep root system consisting of:

• Seminal roots — first roots during germination.
• Crown roots — from lower nodes; form the permanent root system.
• Brace / Prop roots — aerial roots from above-ground nodes providing additional support and nutrient absorption.

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Nutrient Management

• Critical stages for irrigation: Tasseling and Silking. Even 2-3 days of water deficit at this stage can reduce yield by 20-30%.

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Yield

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Sweet Corn

• Harvesting is done 2-3 days after silking ^{UPPSC 2021} at the milk stage when kernels are tender and sugar content is high. Delayed harvesting converts sugar to starch, reducing sweetness.

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Important Maize Varieties ^{Asked in AFO/NABARD}

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Explore More

• Maize cultivation practices and management
• Maize varieties and hybrid seed production

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Summary Table — Maize at a Glance

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Maize: Practical Decision Guide

Maize is unique among cereals — it is cross-pollinated (protandry), making hybrid seed production natural:

Critical growth stage — Tasseling + Silking:

The 7-10 days around tasseling-silking is the make-or-break period for maize. Stress during this window (drought, waterlogging >4-5 hours, or nutrient deficiency) can reduce yield by 40-60%. An AFO officer should advise farmers to ensure:

• Adequate moisture (irrigation if no rain for 5+ days)
• No waterlogging (maize cannot survive >4-5 hours submergence)
• Nitrogen top-dressing completed before tasseling

Why Karnataka leads: Karnataka produces the most maize in India, driven by the poultry feed industry demand in southern India and suitable climate for year-round cultivation (Kharif + Rabi).

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Summary Cheat Sheet