
(l2 + m2) + (m2 + n2) + (n2 + l2) + (2lm + 2mn + 2nl)
= l2 + l2 + m2 + m2 + n2 + n2 + 2lm + 2mn + 2nl
= 2l2 + 2m2 + 2n2 + 2lm + 2mn + 2nl
| A | B | ||
|---|---|---|---|
| (i) | Kharif crops | (a) | Food for cattle | 
| (ii) | Rabi crops | (b) | Urea and super phosphate | 
| (iii) | Chemical fertilizers | (c) | Animal excreta, cow dung urine and plant waste | 
| (iv) | Organic manure | (d) | Wheat, gram, pea | 
| (e) | Paddy and maize | ||