Government Agricultural College, Ludhiana, Punjab
1. Adequate supply of nitrogen was found to be an important single factor in the production of cabbage. The plants which did not receive any dressing of nitrogen showed a very poor all round growth, a low percentage of marketable heads, and consequently yields too low to justify culture of cabbage without manure.
2. The dose of 100 lbs. nitrogen per acre failed to bring about any significant improvement in growth characters, the percentage of marketable heads and yields.
3. The optimum dose of nitrogen appeared to be about 150 lbs. per acre. This gave the highest number and the largest size of leaves, biggest and the heaviest heads, the highest number of marketable heads, and maximum yield of heads and leaves without affecting the percentage of dry matter and the nitrogen. The dose also showed a tendency to induce earliness.
4. The 200 lb., dose of nitrogen per acre seemed excessive as it depressed yield and reduced profits.
5. Nitrogen got greater response when supplied from a combination of Farm Yard Manure and Sulphate of Ammonia than either of these two alone.
