IN 1965 improved varieties of seed were sown on over 50 per cent of China's cultivated land growing rice, wheat, maize, kaoliang, millet and soya beans. This was much more than the area sown with...
Please login first!
IN 1965 improved varieties of seed were sown on over 50 per cent of China's cultivated land growing rice, wheat, maize, kaoliang, millet and soya beans. This was much more than the area sown with...