Water, Nutrients, Radiation and CO2 Use Efficiency of Bulb Crops: A Review

Merkebu Ayalew

doi:10.7176/alst/90-02

Abstract

World’s natural resource will be pressured by population increment that is to achieve high food production through intensive farming. Bulb crops are among largely produced which are characterized by a shallow root system and underground vertical shoots. They are also cool season crops, and their growth and production are influenced by water, nutrients, radiation and carbon-dioxide. Factors that determine their water use efficiency are tillage, stage of the crop, evapotranspiration, irrigation, soil types and elevated co 2 . Nutrient use efficiency of bulbs also influenced by factors like soil factors, fertilizer factors, plant factors, agronomic consideration, biological consideration and climate factors. Nitrogen, phosphorus and potassium are the major consumed nutrients of bulbs. Radiation use efficiency of the bulbs also the key determinant of photosynthesis, photorespiration and respiration. Indicators of radiation use efficiency of bulbs are dry matter production, leaf area index and specific leaf area, ground cover, radiation interception and absorption, maintenance respiration of bulbs and dry matter partitioning. Another essential substrate for photosynthesis of bulb crops is co 2 and the main factors that determine co 2 use efficiency of bulbs are temperature and light. So as different studies indicated that for best production of bulb crops water, nutrient, radiation and co 2 use efficiency of them and the respective determinant factors should be considered and optimized. Keywords: Bulb, Water, Nutrients, Radiation, CO 2 DOI: 10.7176/ALST/90-02 Publication date: November 30 th 2021

Highlights

An increase in population growth will intensify pressure on the world's natural resource base to achieve higher food production through intensive farming (George, 2018)
As indicated above there are ample problems studied and indicated on different literatures related to bulb crops production. Those problems are associated with water, nutrients, radiation and co[2] use efficiency of www.iiste.org bulb crops
Bulb crops are characterized by a shallow root system which explains why fertilizers should be banded at 8-10 cm below the seed row (Baligar et al, 2001; www.sopib.com). 2.1.1 Factors determine bulb crops' nutrient use efficiency (NUE) Overall NUE in plant is a function of capacity of soil to supply adequate levels of nutrients, and ability of plant to acquire, transport in roots and shoot and to remobilize to other parts of the plant

Summary

Introduction

An increase in population growth will intensify pressure on the world's natural resource base (land, water, and air) to achieve higher food production through intensive farming (George, 2018). Basic factors which determine high and quality yielding ability of bulb crops are water, nutrients, radiation and carbon-dioxide. Those problems are associated with water, nutrients, radiation and co2 use efficiency of www.iiste.org bulb crops.

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