Search

The importance to return organic matter to the soil has been widely recognized, especially to agricultural lands that are low in organic matter and nutrients contents that will decrease the productivity of food crops. This study aimed to study the effect of biochar (rice husk and corn cob biochar) and straw compost on soil chemical properties and yield of soybean (Glycine max (L.) Merr. The experiments were done in the laboratory and the field experiment at February–July 2015. The first study was laboratory test using a randomized block designwith three replicates. Soil samples were ground and sieved to obtain the less than 4 mm fraction for the incubation experiment. A five kg soil was mixtured with amandement treatments (A: control; B: Rice husk biochar 10 Mg ha-1 ; C: corn cob 10 Mg ha-1; D: straw compost 10 Mg ha-1; and E. Rice husk biochar 10 Mg ha-1 + straw compost 10 Mg ha-1 ; F. corn cob biochar 10 Mg ha-1 + straw compost 10 Mg ha-1) were filled into plastic pots. The treatments were incubated for 1 and 2 months. Soil samples measured were pH, Organic-C, Total-N, P2O5 (Bray-1), K2O (Morgan), Na, Ca, Mg, S, and CEC. The field experiment was conducted at Sukaraja Nuban Village, Batanghari Nuban sub district, East Lampung Regency. The treatments (similar too laboratory experiment) were arranged in a randomized block design with four replicates. Plot size was 10 m× 20 m, and soybean as crop indicators. The parameters observed were plant heigh, number of branches , number of pods per plant , number of seeds per plant, grain weight, and stover. The results of laboratory experiment showed that application of biochar and compost improve soil fertility due to the increase in soil pH and nutrient availability for plant especially P2O5 and K2O available. The treatment of a rice husk biochar and compost mixture was better than single application to improve soil fertility and soybean yield. Apllication mixture husk biochar 10 Mg ha-1and straw compost 10 Mg ha-1 increased grain weight about 41% compost to control.

he importance to return organic matter to the soil has been widely recognized, especially to agricultural lands that are low in organic matter and nutrients contents that will decrease the productivity of food crops. This study aimed to study the effect of biochar (rice husk and corn cob biochar) and straw compost on soil chemical properties and yield of soybean (Glycine max (L.) Merr. The experiments were done in the laboratory and the field experiment at February–July 2015. The first study was laboratory test using a randomized block design with three replicates. Soil samples were ground and sieved to obtain the less than 4 mm fraction for the incubation experiment. A five kg soil was mixtured with amandement treatments (A: control; B: Rice husk biochar 10 Mg ha-1 ; C: corn cob 10 Mg ha-1; D: straw compost 10 Mg ha-1; and E. Rice husk biochar 10 Mg ha-1 + straw compost 10 Mg ha-1 ; F. corn cob biochar 10 Mg ha-1 + straw compost 10 Mg ha-1) were filled into plastic pots. The treatments were incubated for 1 and 2 months. Soil samples measured were pH, Organic-C, Total-N, P2O5 (Bray-1), K2O (Morgan), Na, Ca, Mg, S, and CEC. The field experiment was conducted at Sukaraja Nuban Village, Batanghari Nuban sub district, East Lampung Regency. The treatments (similar too laboratory experiment) were arranged in a randomized block design with four replicates. Plot size was 10 m × 20 m, and soybean as crop indicators. The parameters observed were plant heigh, number of branches , number of pods per plant , number of seeds per plant, grain weight, and stover. The results of laboratory experiment showed that application of biochar and compost improve soil fertility due to the increase in soil pH and nutrient availability for plant especially P2O5 and K2O available. The treatment of a rice husk biochar and compost mixture was better than single application to improve soil fertility and soybean yield. Apllication mixture husk biochar 10 Mg ha-1and straw compost 10 Mg ha-1 increased grain weight about 41% compost to control.

Fertilizer recommendation in specific location will be related to fertilizers efficiency. The studywas conducted at five locations which were planted with corn minimal once a year, namely: (1) Sidowaras village,Bumi Ratu Nuban Subdistrict, Lampung Tengah Regency; (2) Binjai Ngagung, Bekri Subdistrict, Lampung SelatanRegency; (3) Watu Agung, Kalirejo Subdistrict, Lampung Tengah Regency, (4) Balai Rejo, Kalirejo Subdistrict,Lampung Tengah Regency, and (5) Trimulyo, Tegineneng Subdistrict, Lampung Selatan Regency. The soil sampleswere analyzed in the Research and Development Centre for Soil and Agroclimate Laboratory in Bogor. The value ofP and K in soil were compared to the results of correlation study using several extraction of P and K in Lampung.Results of the study showed that the status of P was high for three location, medium for one location and low for onelocation. K status was low for five locations. Phosphorus fertilizer recommendation on the three locations with highlevel of P (Sidowaras, Binjai Ngagung, and Balai Rejo) was 75 kg ha-1 SP-36, on the middle P levels (Trimulyo) was150 kg and on the low level of P (Watu Agung) was 300 kg. On the other hand, the recommendation for K fertilizer forall locations were 150 kg ha-1 KCl.

Effect of cultural methods on peanut rust leaf intensity and yield. An important disease of peanut is rust leaf caused by Puccinia arachidis. It ussualy occurs with pock marked diseases. Both decreased yield up to 1,0 ton/ha (50% - 60%) compare potention yield of peanut (1,8 ton/ha). The experiment was conducted at Siraman village, Pekalongan residence, Central Lampung from June to December 2000. It applied two methods: Model A (farmers pattern) and Model B (reccomendation pattern) with three replications and four cooperator farmers. The variable were growth percentage, hight of plant, number of pod, wight of wet pod, weight of dry pod, wight of 100 granules, and leaf rot intensity. The result showed the yield of recomendation pattern better than that of farmer pattern, intensity of attacked rust leaf diseases increased from 4,58% to 27,47% on farmer pattern and increased from 3,54% to 33,55% on recomendatin pattern, Macan variety is succeptible with rust leaf diseases and decreased yield up to 41,67%.