Zaenal Kusuma

The effect of sago pith waste granule compost and inorganic fertilizer on soil physical characteristics and corn (Zea mays L.) production in Inceptisol

The study aimed to determine the effect of sago pith waste granule compost and inorganic fertilizers on soil physical characteristics and the results of corn in Inceptisol. The research design used in this study was a randomized block design with three replications. Treatment consisted of: no fertilizer (KGES1), with granule 8 t ha -1 compost (KGES2), inorganic fertilizer (Urea, SP - 36, and KCl), recommended dosage (KGES3), inorganic fertilizer + granule 8 t ha - compost ( KGES4 ), ½ x dose of inorganic fertilizer + compost granule (8 t ha -1 ) (KGES5) , 2 doses of inorganic fertilizer + granule 8 t ha -1 compost (KGES6), ½ x dose of inorganic fertilizer + 12 t ha -1 granule compost (KGES7) and 2 times the dose of inorganic fertilizer + 4 t ha compost (KGES8). The results showed that sago pith waste granule compost and inorganic fertilizers significantly affect the physical characteristics of the soil that is categorized into heavy volume of soil (0.80 g cm -3 ), soil particle density (2.30 g cm -3 ), soil porosity (7.77 %), fast drainage pore (23:54 %), slow drainage pore (8.83 %), available water pore (11.62 %), and unavailable water pore (11:31). On the other hand, the plant growth (plant height) and dry shelled corn grain results amounted to 249.17 cm and 7.85 tones ha -1 . The combination of sago pith waste granule compost and inorganic fertilizer may improve the results of 30-47 % better compared to inorganic fertilizer or granule compost alone. Excessive inorganic fertilizer did not show the significant increase of dry shelled corn seeds productions. Based on these results, the reduction of a half dose of inorganic fertilizer combined with 12 t ha -1 granule compost yielded of dry shelled corn grain of the highest (7.85 t ha -1 ) or in percentage the increase of the results of 32 % of inorganic fertilizer application.

Soil Health Improvement by Addition the Manure and Compost for Peanut Plant (Arachis Hypogaea L) in Leranwetan, Palang, Tuban

The content of organic matter in the soil is one of the factors that contribute in determining the success of cultivation agricultural. This is because organic matter can increase the fertility of the chemical, physical and biological soil. Determination of organic matter content is done based on the number of C- organic. The low organic matter in the soil is because of the intensive agricultural system. Soil conditions in Palang has very low C-organic content, the average is less than 1%. The C-organic content less than 1% of the soil cannot provide sufficient nutrients, in addition to the nutrients supplied by manure are unable to be handled by the soil components so easily leached, decreased cation exchange capacity, weakening the soil aggregation, micro nutrients easily leached and decreased the power of water binding. Through the addition of organic matter, the soil structure that was weight becomes relatively lighter crumb. Vertical water movement or infiltration can be improved and the soil can absorb water more quickly so that minimizing runoff and erosion. As well as with soil aeration to be better because the soil pore space (porosity) increases due to the formation of aggregates. The addition of organic matter to the soil is in the form of compost litter and cow manure. The results of this study are the results after the addition of organic matter such as cow manure and compost litter. The highest C-organic content of the soil is in the treatment P6 (cow manure) by 1.46%, while the highest production in the treatment P3 (compost litter) was 16.58 kg. The suggestions that could be addressed in this study are the need for increasing doses of cow manure and compost litter to improve C-organic content of the soil. There need to research on the effect of a combination of cow manure and compost litter in improving the soil fertility in the aspect of chemical, physical and biological soil.