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Could anyone please help me understand what is wrong with the tomatoes in my garden? I am new to gardening. I used compost( I made it at home) before I planted these plants. The plants which were slow to start were the ones with tomatoes with this defect. Tomatoes of other plants seem to be big and nice. Tomatoes from these plants are small and have this defect at the bottom. Is it due to some insects/bugs?

To reduce blossom-end rot in tomato, implement the following steps:

1. Lime tomato soils to pH 6.5 to 6.7 -- Home gardens not limed in the past 2 to 3 years will need 2 cups of lime for each plant. The lime should be worked into the soil 12 inches deep. To determine the exact amount of lime, if you are in North Carolina, send a soil sample to the NCDA&CS Agronomic Division, 4300 Reedy Creek Road, Raleigh, N. C. 27607-6465 for analysis and recommendations.
2. Fertilize properly -- Applying too much fertilizer at one time can result in blossom-end rot. Following soil test recommendations is the best way to insure proper fertilization. For home gardens not soil tested, apply 5 pints of 8-8-8 per 100 ft of row and work it thoroughly into the top 8 inches of soil.
3. Mulch plants -- Use straw, pine straw, decomposed sawdust, ground decomposed corn cobs, plastic, or newspapers. Mulches conserve moisture and reduce blossom-end rot. In extreme drought, plastic may increase blossom-end rot if plants are not watered.
4. Irrigate when necessary -- Tomato plants require about 1.5 inches of water per week during fruiting. This amount of water should be supplied by rain or irrigation. Extreme fluctuations in soil moisture result in a greater incidence of blossom-end rot.
5. Spray calcium -- The plants may be sprayed with a calcium solution at the rate of 4 lb of calcium nitrate or calcium chloride per 100 gal of water (or 4 level Tbs per gal of water). This spray should be applied 2 to 3 times a week, beginning at the time the second fruit clusters bloom. These materials can be mixed with the spray that is used for control of foliar diseases. Chelated calcium solutions also provide an excellent source of calcium. When using these chelates, follow label directions. Several foliar spray materials containing calcium are available and all work well for tomatoes.