Q.21
ICAR AIEEA PG 2024 - Physical Science
Arranging Order +4 −1
English हिन्दी

Arrange the following factors affecting irrigation water quality in agriculture in the correct sequence:

(A) . Salinity
(B) . pH
(C) . Sediment content
(D) . Chemical contaminants

Choose the correct answer from the options given below:

कृषि में सिंचाई जल की गुणवत्ता को प्रभावित करने वाले निम्नलिखित कारकों को सही क्रम में व्यवस्थित करें:

(A) . लवणता (Salinity)
(B) . pH
(C) . अवसाद सामग्री (Sediment content)
(D) . रासायनिक संदूषक (Chemical contaminants)

नीचे दिए गए विकल्पों में से सही उत्तर चुनें:

EXPLANATION Irrigation Water Quality Standards: EC, SAR, RSC, Boron Hazard and Water Usability Classification

In the standard evaluation protocol of irrigation water quality:

  • Salinity hazard (measured via electrical conductivity, $EC_w$) is the foremost criteria affecting osmotic potential and plant water uptake.
  • Physical suspended sediment/turbidity content affects infiltration, drip emitter clogging, and soil surface sealing.
  • Chemical contaminants and specific ion toxicities (sodium adsorption ratio $SAR$, residual sodium carbonate $RSC$, boron, chloride, heavy metals).
  • Reaction ($pH$) which indicates extreme acidity or basicity (normally buffered between 6.5 and 8.4).
    Following the exam sequence: (A), (C), (D), (B).

कृषि सिंचाई जल की गुणवत्ता के मूल्यांकन के मानक पदानुक्रम में:

  • लवणता (Salinity / विद्युत चालकता $EC$): जल की गुणवत्ता का प्राथमिक कारक जो परासरणी दाब और फसल द्वारा जल अवशोषण को निर्धारित करता है।
  • अवसाद सामग्री (Sediment content): निलंबित ठोस पदार्थ जो ड्रिप उत्सर्जकों को अवरुद्ध करते हैं और मृदा सतह को सील करते हैं।
  • रासायनिक संदूषक (Chemical contaminants): विशिष्ट आयन विषाक्तता जैसे सोडियम, बोरोन, भारी धातुएं आदि।
  • pH: जल की अम्लीय या क्षारीय प्रकृति का अंतिम संकेतक।
अतः सही क्रम (A), (C), (D), (B) है।
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