How to fertilize in rice field

Rice need many kinds of fertilisers,Usually it will consume 9-12.5kg Nitrogen, 4-6kg P2O5 and 10.5-15kg K2O in yielding 500kg rice,The fertilizering proportion of N,P2O5 and K2O is around 2:1:3. The Nitrogen absorption of rice reaches the peak period during the tillering stage and heading, flowering stage. Fertilizering Nitrogen can increase the starch output and improve the rice quality.The P2O5 absorption of rice  is mainly happened from the tillering stage to ear primordial stage. Fertilizering P2O5 can promote the rice root growth and nutrient absorption,enhance tillering,increase the starch synthesis and get enriched kernel. The K2O absorption of rice is mainly happened from ear primordial stage to heading,flowering stage, secondly from tillering stage to ear primordial stage.K2O is the indispensible  nutrient to synthesize and deliver the starch and cellulose in rice,which can improve the root vitality, postpone the leaves grow old,enhance the ability of resistance of insect pests and diseases. Additionally, fertilizing Silicon and Zinc are good to increase the rice output and quality. There are 10% to 20% SIO2 in rice’s stem and leaves, Fertilizing Silicon can enhance the ability of resistance of insect pests and diseases and the ability of lodging resistance,increase the rice output and quality; Fertilizing Zinc can increase the effective panicles,kenels,TKW etc,decrease empty abortive rate, and realize the output increasing,The effect is remarkable in Calcareous soil. The effect of fertilizing Silicon and Zince is quite outstanding in new paddy field, acidic soil and cold water field

Fertilizing skill

Seedling bed fertilization and rice seedling include watered seedling, wetland raised seedling,dryland raised seedling, thermal plastic film seedling,two-stages seedling and plastic trap seedling etc. Base fertilizing should select good quality organic fertilizers which have the good characters of viscosity, absorbability and substitution, enhance the soil crumb structure and increase the capability of water and fertilizer conservation, It’s a good soil conditioner. Usually apply 500-1000kg Organic fertilizers with 3-5kg Urea,8-15kg DAP,7-8kg KCL per Mu simultaneously or apply 20-30kg compound fertilizers per Mu.It will promote the Rice growth stronger and more uniform. 4-5days Before colonization, Apply 6-7kg Urea or 8-10kg high Nitrogen content compound fertilizer per Mu,It will be conducive to rice rejuvenation ASAP after colonization.

　　Apply enough base fertilizers in field, Especially the organic fertilizers, Usually 2000-3000kg per Mu. In early stage of rice growth, Nitrate Nitrogen is seldom absorbed ,Its better to apply Ammonium Nitrogen fertilizers. Usually apply 10-15kg Urea ,30-4-kg SSP,8-10kg KCL or 30-40kg compound fertilizers(15% respectively) per Mu.And apply extra 6-8kg silicon fertilizer,1-1.5kg Zinc sulfate per Mu. Base fertilizing in field should apply into underground,12-20cm depth during the ploughing,It will keep Ammonium content more stable in anoxic environment and avoid the effective content loss.

　After manuring(1)Applying tillering fertilizer ASAP after colonization. It will promote low node tillering growth and increase spikes. Tillering fertilizer usually apply twice,1^st time to apply after rejuvenation,7-8kg Urea or High Nitrogen content compound fertilizer with proper quantity Calcium Sulfate, Zinc Sulfate per Mu to increase the tillers,2^nd time to apply in the peak period of tillering,Urea or 7-8kg high Nitrogen content compound fertilizer per Mu to realize uniform growth in whole filed and promote the tillers growing up to spikes.

　　 (2)Time to apply spike fertilizers. It’s the fundamental stage of spike formation and kernel growth when the top 2^nd leaf appearance and the young spike growing up to 1cm length, We need to control the ineffective tillering. At that time, Apply 8-12kg Urea or 10-15kg high content Nitrogen compound fertilizer per Mu and 50g seaweed boron fertilizer in leaf surface per Mu.it will guarantee the sufficient  nutrition transport to the reproduction growth, increase the glumes and suppress the glume regression, promote the spike growth and increasing kenel weight, also protect the root, nourish leaves, strength stem and anti-lodging.In small group filed, Apply spike fertilizer can move up to the stage of Spike Differentiation.

　　(3)Supplementary Granular fertilizer. It will improve the setting percentage,gurantee completed mature and increase the thousand kernel weight from the period of heading to mature. Supplementary fertilizer is subjected to the rice growth situation, few better than more in quantity, Usually spray 50-60kg KH2PO4 solution(0.2%-0.3%content); Its better to spray high potassium content seaweed fertilizer-Baihemao(dilution rate 2000),40g per Mu,When the rice lack of Zinc absorption, spray 45g Bailu or 100g Baian per Mu,The related symptoms will be improved properly. If the leaves fade and yellowing in field before heading, apply 3-4kg Urea or 4-5kg high Nitrogen content compound fertilizer. if the symptoms are slight, spray Baian to leaf surface 2-3 times(permit to apply with anti-pest and anti-disease medicines together).  ；Supplementary granular fertilizer can effectively enhance the rice anti-adversity and resistance; prolong the leaf function period and prevent premature. improve the oxygen supply to root and increase the root system vitality; Speed up grain filling, promote rice mature and kernel enrichment to realize the output increasing and improve the rice quality. Highly Attention that do not apply granular fertilizers if the following situations happened in field: applying sufficient fertilizers in early stage, too many trillers in middle stage, leaf color is dark green, poor light distribution in group, late-maturing.
Fouthermore,Please arrange drainage before applying fertilizers in saline and alkaline land. Around 3-4days before applying, irrigation in the daytime and drainage at night,It will avoid the temporarily accumulated salt to influence the effect of fertilizer.