Q.45
ICAR AIEEA PG Agronomy 09 July 2023 (Shift 1) Paper
Arranging Order
English हिन्दी

Using the following types of water erosion, find which order is the correct chronological sequence :

(A) Splash erosion
(B) Sheet erosion
(C) Rill erosion
(D) Gully erosion

Choose the correct answer from the options given below :

जल क्षरण के निम्नलिखित प्रकारों का सही कालानुक्रमिक क्रम कौन सा है?

(A) स्प्लैश क्षरण (बौछार क्षरण)
(B) परत क्षरण (Sheet erosion)
(C) रिल क्षरण (Rill erosion)
(D) अवनालिका क्षरण (Gully erosion)

नीचे दिए गए विकल्पों में से सही उत्तर चुनिए :

EXPLANATION Acid, Acid-Sulfate, Calcareous and Degraded Problem Soils: Liming, Amelioration and Crop Adaptation
  • The progressive sequence of water erosion stages develops as follows:
  • Splash erosion (A): First stage; impact of falling raindrops shatters soil aggregates and splashes particles into air.
  • Sheet erosion (B): Second stage; uniform removal of a thin layer of topsoil by shallow overland sheet flow (the most insidious 'silent thief' of soil fertility).
  • Rill erosion (C): Third stage; concentrated runoff cuts tiny, distinct finger-like micro-channels (< 30 cm deep) that can still be smoothed out by normal tillage implements.
  • Gully erosion (D): Advanced fourth stage; severe deepening and widening of rills into massive ravines that cannot be crossed or removed by ordinary farm implements.
  • Correct chronological order: (A) -> (B) -> (C) -> (D), confirming Option 1.
  • जल क्षरण के विकास का सही क्रमिक चरण निम्न प्रकार है:
  • स्प्लैश/बौछार क्षरण (A): प्रथम चरण; वर्षा की बूंदों की गतिज ऊर्जा से मृदा कण टूटकर छिटकते हैं।
  • परत क्षरण (B): द्वितीय चरण; वर्षा जल की पतली चादर द्वारा उपजाऊ ऊपरी मृदा का एकसमान बह जाना (इसे 'किसान की मूक मृत्यु' कहते हैं)।
  • रिल क्षरण (C): तृतीय चरण; पानी के बहाव से खेत में छोटी अंगुली जैसी नालियां बन जाती हैं जिन्हें सामान्य जुताई से मिटाया जा सकता है।
  • अवनालिका क्षरण (D): अंतिम चरण; रिल नालियां गहरी होकर बड़े खड्डों (Gullies) में बदल जाती हैं जिन्हें सामान्य जुताई से ठीक नहीं किया जा सकता।
  • अतः सही क्रम (A) → (B) → (C) → (D) है (विकल्प 1 सही है)।
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