The Cauliflower (Brassica oleracea L.) PM 126 F1 is one of the vegetable commodities with a high enough demand because this vegetable is widely consumed by the public. This experiment purposes to get a dose combination of oyster mushroom waste organic fertilizer and NPK fertilizer which gives the highest growth and yield of cauliflower. The method of research used is the experimental method. The design of experimental used was randomize block design (RBD) with a single factor that consisted of 8 treatments with 3 replications, that is : A (control), B (10 ton/ha Organic fertilizer), C (20 ton/ha Organic fertilizer), D (30 ton/ha Organic fertilizer), E (NPK 800 kg/ha), F (10 ton/ha Organic fertilizer + NPK 800 kg/ha), G (20 ton/ha Organic fertilizer + NPK 800 kg/ha), H (30 ton/ha Organic fertilizer + NPK 800 kg/ha). the result highest curd weight is 7,75 ton/ha achieved by treatment G is 20 ton/ha waste compost of oyster mushroom and 800 kg/ha NPK fertilizer.

Coal bottom ash and cattle manure can be used as soil ameliorant. The application of coal bottom ash and cattle manure can improve the soil chemical properties, such as pH and the amounts of available nutrients in soil. The objective of the study was to understand the effect of coal bottom ash and cow manure application on soil chemical properties and heavy metal contents in soil and mustard (Brassica juncea).  A pot experiment was conducted in a greenhouse, including three treatment factors, i.e. age of coal bottom ash (fresh, 4 months and 2 years), dose of coal bottom ash, i.e. 0, 40 and 80 Mg ha-1, and dose of cattle manure, i.e. 0 and 10 Mg ha-1. The results show that the application of coal bottom ash and cattle manure increased the pH and the amounts of total-N, available-P and exchangeable cations (K, Ca and Mg) of the soil. The application of coal bottom ash increased the amounts of Pb, Cd and Co in the soil, but did not increase the amounts of Pb and Co in mustard, while the application of cattle manure increased the amount of Cd both in soil and mustard.  Keywords: Coal bottom ash, cattle manure, heavy metal, mustard, soil ameliorant

Lettuce (Lactuca sativa) belongs to the asteraceae family, known worldwide and appreciated for generations. Due to the great acceptance, the lettuce is a vegetable of high consumption. In search of solutions for high productivity some techniques have been researched to reduce the stress suffered by the plant to the environment. This study aimed to verify that the aqueous extract of tiririca, in different strengths, present some allelopathic effect on the development of the lettuce. The use of the aqueous extract, which has in its composition the Indole Acetic Acid-AIA (Auxin), was used by capillary irrigation, with the following treatments: T0-control; T1- 25% of concentration; T2- 50% of concentration; T3- 100% of concentration. This study consisted of five replicates and five plants per treatment, with a total of 100 plants. The design was completely randomized. The analyzes were root size, shoot development by fresh mass plant, number of leaves and chlorophyll content. According to the data, it was observed that the concentration of the 100% root extract resulted in higher values of root development, however, affected shoot growth, a result verified in the fresh mass, in which the plants presented reduced weight when compared to the other treatments, and consequently affected the amount of leaves produced by the plants submitted to this treatment, the chlorophyll content was also lower for the plants treated with the maximum concentration of the extract. Therefore, it can be concluded that high dosages of the tiririca extract had an allelopathic effect inhibiting the growth and development of the lettuce plants, and did not present a satisfactory result.

This study aims to determine the optimal dosage of bottom ash and organic matter which can increase the growth and yield of mustard plants. The study was carried out in the greenhouse of the Soil Physics Laboratory, Balai Penelitian Tanah, Laladon, Bogor from August 2015 to January 2016. The study used factorial complete randomized design (CRD). The first factor is the age of bottom ash (fresh, 4 months and 2 years). The second factor is the bottom ash dose with three levels, which are 0, 60 and 120 grams / pot (equivalent to 0, 40 and 80 tons / ha) and the third factor is the dose of organic matter with two levels, namely 0 and 15 grams / pot (equivalent to 0 and 10 tons / ha). The results showed that the addition of fresh bottom ash with a dose of 80 tons / ha and 10 tons / ha of organic matter significantly affected the plant height. While on the parameters of the number of leaves and fresh weight of mustard plant, the treatment that gives a significant effect is 10 tons / ha of organic matter. The best dose that can increase the growth and yield of mustard plants is fresh bottom ash with a dose of 80 tons / ha and 10 tons / ha of organic matter.